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问题 多项选择题

输变电、供电、发电、集中检修和施工企业安全生产目标为（）。

A、满足百日安全个数

B、不发生重大设备事故

C、不发生重大电网事故

D、不发生人身死亡事故

答案

参考答案：A, B, C, D

实验题

下图1是改进的电解水的实验装置示意图，下图2是课本中电解水的实验装置示意图。请据图回答下列问题：                                         

（1）写出电解水的符号表达式：_____________ ；

（2）用玻璃三通管将图1装置电解水时产生的气体混合在一起，点燃用该混合气吹出的肥皂泡时的实验现象是：___________；

（3）图1实验装置的优点是：________________ ；

（4）与图2装置相比，用图1装置进行该实验的主要不足之处是：_______________。
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单项选择题

A local elementary school has requested scoliosis screening for its students from the hospital’s community outreach program. The school should be informed that（）

A. these students are too young to screen; instead, older students should be screened.

B. these students are too old to screen and will no longer benefit from screening for scoliosis.

C. scoliosis screening requires sophisticated equipment and can’t be done in school.

D. this is an appropriate request and arrangements will be made as soon as possible.
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