人体碰到漏电设备的金属外壳造成的触电叫()触电。A、跨步电压B、直接接触C、间接接触

题型:单项选择题

问题:

人体碰到漏电设备的金属外壳造成的触电叫()触电。

A、跨步电压

B、直接接触

C、间接接触

考点:电工特种作业操作证电工复审电工复审题库
题型:单项选择题
关于x的一元二次方程(a-1)x2+a2-1=0的一个根是x=0,则a等于(  )
A.1B.-1C.±1D.
1
2
题型:单项选择题

阅读理解。

     A Sally and Tom are classmates. Here are their plans for next weekend.

     Sally's plan

Saturday 

9∶00 a.m.~10∶00 a.m.     take part in the English corner

4∶00 p.m.~5∶00 p.m. have an art lesson

8∶00 p.m.~10∶00 p.m. be at Alice's birthday party

Sunday 

8∶00 a.m.~10∶30 a.m. do some reading at home

3∶30 p.m.~5∶00 p.m. draw pictures in the park

7∶00 p.m.~9∶30 p.m. do my homework

                                           Tom's play

Saturday 

8∶00 a.m.~10∶00 a.m.     do my homework at home

4∶30 p.m.~5∶45 p.m. play basketball

8∶00 p.m.~10∶00 p.m. be at Alice's birthday party

Sunday 

8∶20 a.m.~11∶00 a.m. roller skate

4∶05 p.m.~5∶30 p.m. climb the hill

7∶30 p.m.~9∶30 p.m. watch TV

1. Sally will stay in the park for ________ on Sunday afternoon.

A. one hour

B. two hours

C. one and a half hours

D. two and a half hours

2. Sally will be free at ________.

A. 9∶30 a.m. on Saturday

B. 4∶25 p.m. on Saturday

C. 10∶50 a.m. on Sunday

D. 4∶30 p.m. on Sunday

3. Tom will be ________ at 9∶25 on Saturday morning.

A. at home

B. on the playground

C. on the hill

D. in the park

4. Both Sally and Tom plan to ________ next Saturday evening.

A. do some reading

B. do their homework

C. go to the English corner

D. go to Alice's birthday party

5. According to Tom's plan, we know he prefers ________.

A. drawing pictures

B. doing exercise

C. watching TV

D. reading books

题型:单项选择题

以下哪项是影响小儿生长发育最基本的因素()。

A.生长发育个体差异

B.生长发育顺序不同

C.遗传和环境影响

D.神经系统发育早晚

E.生殖系统发育早晚

题型:单项选择题

梁和板的混凝土应()

A.在柱浇筑前1~1.5h浇筑

B.任何时候均应同时浇筑

C.高度大于1.5m的梁要单独浇筑

D.一般情况下应同时浇筑

题型:单项选择题

脊髓灰质炎疫苗正确的免疫计划方法是()

A.出生后2~4个月开始口服三联混合疫苗,连服3次,间隔1个月,4岁加强1次

B.出生后6个月开始口服三联混合疫苗,连服3次,间隔半年,12岁加强1次

C.出生后24小时开始口服三联混合疫苗,按0、1、6个月连服3次,5~10年后加强1次

D.出生后1岁开始口服三联混合疫苗,连服3次,间隔半年,12岁加强1次

E.出生后6个月开始口服三联混合疫苗1次,6岁加强1次

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