[
   {
    "pid": "1",
    "question":"这是什么类型的水工挡土墙? ",
    "image":"images/1.jpg",
    "choices": ["重力式","衡重式","悬臂式","板桩式","锚杆式","加筋式","扶壁式"],
    "unit":null,
    "percision":null,
    "answer":"重力式",
    "question_type": "mlti_choice",
    "answer_type": "text"
  },
  {
   "pid": "2",
   "question":"水工挡土墙的顶标高是多少？",
   "image":"images/2.jpg",
   "choices": null,
   "unit": "m",
   "percision": 2,
   "answer": 302.70,
   "question_type":"free_form",
   "answer_type":"float"
  },
  {
   "pid": "3",
   "question":"水工挡土墙的底标高是多少？",
   "image":"images/2.jpg",
   "choices": null,
   "unit": "m",
   "percision":  2,
   "answer": 296.00,
   "question_type":"free_form",
   "answer_type":"float"
   },
  {
   "pid": "4",
   "question":"水工挡土墙的墙顶宽度是多少？",
   "image":"images/2.jpg",
   "choices": null,
   "unit": "mm",
   "percision": null,
   "answer": 600,
   "question_type":"free_form",
   "answer_type":"integer"
  },
 {
   "pid": "5",
   "question":"水工挡土墙的基底宽度是多少？",
   "image":"images/2.jpg",
   "choices": null,
   "unit": "mm",
   "percision": null,
   "answer": 2000,
   "question_type":"free_form",
   "answer_type":"integer"
  },
{
    "pid":6,
    "question":"水工挡土墙塑料排水管直径为多少? ",
    "image":"images/2.jpg",
    "choices":null,
    "unit":"mm",
    "percision":null,
    "answer":50,
    "question_type":"free_form",
    "answer_type":"integer"
 },
 {
    "pid":7,
    "question":"水工挡土墙M10水泥砂浆层的厚度是多少? ",
    "image":"images/2.jpg",
    "choices":null,
    "unit":"cm",
    "percision":null,
    "answer": 3,
    "question_type":"free_form",
    "answer_type":"integer"
 },
 {
    "pid":8,
    "question":"水工挡土墙浆砌石的强度等级是多少? ",
    "image":"images/2.jpg",
    "choices":null,
    "unit":"MPa",
    "percision":1,
    "answer": 7.5,
    "question_type":"free_form",
    "answer_type":"float"
 },
 {
    "pid":9,
    "question":"水工挡土墙砂浆勾缝的强度等级是多少? ",
    "image":"images/2.jpg",
    "choices":null,
    "unit":"MPa",
    "percision":null,
    "answer": 10,
    "question_type":"free_form",
    "answer_type":"integer"
 },
 {
    "pid":10,
    "question":"水工挡土墙设计开挖线比例是多少? ",
    "image":"images/2.jpg",
    "choices":null,
    "unit":null,
    "percision":null,
    "answer":"1:1",
    "question_type":"free_form",
    "answer_type":"text"
 },
 {
   "pid": 11,
   "question":"水工挡土墙是用什么材料回填的？",
   "image":"images/2.jpg",
   "choices": null,
   "unit": null,
   "percision": null,
   "answer":"砂砾石",
   "question_type":"free_form",
   "answer_type":"text"
  },
{
   "pid": 12,
   "question":"水工挡土墙是用什么材料填筑的？",
   "image":"images/2.jpg",
   "choices": null,
   "unit": null,
   "percision": null,
   "answer":"砂砾石",
   "question_type":"free_form",
   "answer_type":"text"
  },
{
   "pid": 13,
   "question":"水工挡土墙的反滤层如何设置？",
   "image":"images/2.jpg",
   "choices": null,
   "unit":  null,
   "percision": null,
   "answer":"土工织物包管头",
   "question_type":"free_form",
   "answer_type":"text"
  },
{
   "pid": 14,
   "question":"水工挡土墙的墙体用什么材料填充？",
   "image":"images/2.jpg",
   "choices": null,
   "unit": null,
   "percision": null,
   "answer":"M10水泥砂浆",
   "question_type":"free_form",
   "answer_type":"text"
  },
{
    "pid": 15,
    "question":"这是什么类型的水工挡土墙? ",
    "image":"images/4.jpg",
    "choices":["重力式","衡重式","悬臂式","板桩式","锚杆式","加筋式","扶壁式"],
    "unit":null,
    "percision":null,
    "answer":"重力式",
    "question_type":"mlti_choice",
    "answer_type":"text"
  },
 {
   "pid": 16,
   "question":"水工挡土墙的顶标高是多少？",
   "image":"images/4.jpg",
   "choices": null,
   "unit": "m",
   "percision": 2,
   "answer":"145.17",
   "question_type":"free_form",
   "answer_type":"float"
  },
{
   "pid": 17,
   "question":"水工挡土墙的顶标高是多少？",
   "image":"images/4.jpg",
   "choices": null,
   "unit": "m",
   "percision": 2,
   "answer": 145.17,
   "question_type":"free_form",
   "answer_type":"float"
  },
{
   "pid": 18,
   "question":"水工挡土墙的底标高是多少？",
   "image":"images/4.jpg",
   "choices": null,
   "unit": "m",
   "percision": 2,
   "answer": 141.68,
   "question_type":"free_form",
   "answer_type":"float"
  },
 {
   "pid": 19,
   "question":"水工挡土墙的墙顶宽是多少？",
   "image":"images/4.jpg",
   "choices": null,
   "unit": "mm",
   "percision": null,
   "answer": 300,
   "question_type":"free_form",
   "answer_type":"integer"
  },
{
   "pid": 20,
   "question":"水工挡土墙的反滤层如何设置？",
   "image":"images/4.jpg",
   "choices": null,
   "unit":  null,
   "percision": null,
   "answer":"土工织物包排水管口，级配碎石厚300mm，宽500mm通长布置",
   "question_type":"free_form",
   "answer_type":"text"
  },
{
   "pid": 21,
   "question":"水工挡土墙的基础砼强度是多少？",
   "image":"images/4.jpg",
   "choices": null,
   "unit":  null,
   "percision": null,
   "answer":"C20",
   "question_type":"free_form",
   "answer_type":"text"
  },
{
   "pid": 22,
   "question":"水工挡土墙的基底宽度是多少？",
   "image":"images/4.jpg",
   "choices": null,
   "unit": "mm",
   "percision": null,
   "answer": 2216,
   "question_type":"free_form",
   "answer_type":"integer"
  },
 {
    "pid":23,
    "question":"水工挡土墙土工布单位平面的质量是多少? ",
    "image":"images/4.jpg",
    "choices":null,
    "unit":"g*g/m",
    "percision":null,
    "answer": 300,
    "question_type":"free_form",
    "answer_type":"integer"
   },
  {
    "pid":24,
    "question":"水工挡土墙级配碎石的厚度和宽度分别是多少? ",
    "image":"images/4.jpg",
    "choices":null,
    "unit":"mm",
    "percision":null,
    "answer":"300，500",
    "question_type":"free_form",
    "answer_type":"text"
 },
{
   "pid": 25,
   "question":"水工挡土墙的基础高度是多少？",
   "image":"images/4.jpg",
   "choices": null,
   "unit": "mm",
   "percision": null,
   "answer": 2216,
   "question_type":"free_form",
   "answer_type":"integer"
  },
{
   "pid": 26,
   "question":"水工挡土墙的墙身高度是多少？",
   "image":"images/4.jpg",
   "choices": null,
   "unit": "mm",
   "percision": null,
   "answer": 3490,
   "question_type":"free_form",
   "answer_type":"integer"
  },
{
    "pid": 27,
    "question":"这是什么类型的水工挡土墙? ",
    "image":"images/5.jpg",
    "choices":["重力式","衡重式","悬臂式","板桩式","锚杆式","加筋式","扶壁式"],
    "unit":null,
    "percision":null,
    "answer":"悬臂式",
    "question_type":"mlti_choice",
    "answer_type":"text"
  },
{
    "pid":28,
    "question":"水工挡土墙第一个排水管安装位置是多少? ",
    "image":"images/5.jpg",
    "choices":null,
    "unit":"mm",
    "percision":null,
    "answer":"300~500",
    "question_type":"free_form",
    "answer_type":"text"
 },
{
    "pid": 29,
    "question":"这是什么类型的水工挡土墙? ",
    "image":"images/6.jpg",
    "choices":["重力式","衡重式","悬臂式","板桩式","锚杆式","加筋式","扶壁式"],
    "unit":null,
    "percision":null,
    "answer":"扶壁式",
    "question_type":"mlti_choice",
    "answer_type":"text"
  },
{
    "pid": 30,
    "question":"这是什么类型的水工挡土墙? ",
    "image":"images/7.jpg",
    "choices":["重力式","衡重式","悬臂式","板桩式","锚杆式","加筋式","扶壁式"],
    "unit":null,
    "percision":null,
    "answer":"衡重式",
    "question_type":"mlti_choice",
    "answer_type":"text"
  },
{  
    "pid":31,
    "question":"水工挡土墙填土高度为多少? ",
    "image":"images/7.jpg",
    "choices":null,
    "unit":"mm",
    "percision":null,
    "answer": 5000,
    "question_type":"free_form",
    "answer_type":"integer"
 },
{
    "pid": 32,
    "question":"这是什么类型的水工挡土墙? ",
    "image":"images/8.jpg",
    "choices":["重力式","衡重式","悬臂式","板桩式","锚杆式","加筋式","扶壁式"],
    "unit":null,
    "percision":null,
    "answer":"衡重式",
    "question_type":"mlti_choice",
    "answer_type":"text"
  },
{
   "pid": 33,
   "question":"水工挡土墙的顶标高是多少？",
   "image":"images/8.jpg",
   "choices": null,
   "unit": "m",
   "percision": 2,
   "answer": 1204.45,
   "question_type":"free_form",
   "answer_type":"float"
  },
{
   "pid": 34,
   "question":"水工挡土墙的底标高是多少？",
   "image":"images/8.jpg",
   "choices": null,
   "unit": "m",
   "percision":  2,
   "answer": 1199.28,
   "question_type":"free_form",
   "answer_type":"float"
  },
 {
   "pid": 35,
   "question":"水工挡土墙的墙顶宽度是多少？",
   "image":"images/8.jpg",
   "choices": null,
   "unit": "mm",
   "percision": null,
   "answer": 50,
   "question_type":"free_form",
   "answer_type":"integer"
  },
{
   "pid": 36,
   "question":"水工挡土墙的基础高度是多少？",
   "image":"images/8.jpg",
   "choices": null,
   "unit": "mm",
   "percision": null,
   "answer": 50,
   "question_type":"free_form",
   "answer_type":"integer"
  },
{
   "pid": 37,
   "question":"水工挡土墙的墙身高度是多少？",
   "image":"images/8.jpg",
   "choices": null,
   "unit": "mm",
   "percision": null,
   "answer": 516,
   "question_type":"free_form",
   "answer_type":"integer"
  },
{
   "pid": 38,
   "question":"水工挡土墙的基底宽度是多少？",
   "image":"images/8.jpg",
   "choices": null,
   "unit": "mm",
   "percision": null,
   "answer": 126,
   "question_type":"free_form",
   "answer_type":"integer"
  },
{
    "pid": 39,
    "question":"这是什么类型的水工挡土墙? ",
    "image":"images/9.jpg",
    "choices":["重力式","衡重式","悬臂式","板桩式","锚杆式","加筋式","扶壁式"],
    "unit":null,
    "percision":null,
    "answer":"重力式",
    "question_type":"mlti_choice",
    "answer_type":"text"
  },
 {
    "pid":40,
    "question":"水工挡土墙桩的埋深是多少? ",
    "image":"images/9.jpg",
    "choices":null,
    "unit":"m",
    "percision":2,
    "answer": 6.00,
    "question_type":"free_form",
    "answer_type":"float"
 },
 {
    "pid":41,
    "question":"水工挡土墙搭板的长是多少? ",
    "image":"images/9.jpg",
    "choices":null,
    "unit":"m",
    "percision":2,
    "answer": 8.50,
    "question_type":"free_form",
    "answer_type":"float"
 },
 {
    "pid":42,
    "question":"水工挡土墙桩的总长是多少? ",
    "image":"images/9.jpg",
    "choices":null,
    "unit":"m",
    "percision":2,
    "answer": 15.00,
    "question_type":"free_form",
    "answer_type":"float"
 }
]