【简答题】【消耗次数：1】
电流对人体的作用有哪些？
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相关题目
【单选题】
关于电流作用人体时间，下列错误的是（）。
①
随着电流作用时间越长人体电阻减小点击危险性越大
②
随着电流作用时间越长，能量增加，伤害程度增高，表现为摆脱电流减小
③
随着电流作用时间越长，中枢神经反射越强烈，电击危险性越大
④
人体电阻由于出汗、击穿、电解而下降。
【简答题】
学前教育对经济发展的作用有哪些？
【单选题】
通过人体的电流越大危险性越大，根据人体状态，可将通过的电流分为三个逐级提升的级别：（）。
①
感知电流—摆脱电流—室颤电
②
摆脱电流--感知电流—室颤电流
③
室颤电流—摆脱电流—感知电流
④
感知电流—室颤电流—摆脱电流
【多选题】
触电事故分为电击和电伤，电击是电流直接作用于人体所造成的伤害；电伤是电流转换成热能，机械能等其他形式的能量作用于人体造成的伤害。人触电时，可能同时遭到电击和电伤。电击的主要特征有（）。
①
A.A.致命电流小
②
B.主要伤害人的皮肤和肌肉
③
C.人体表面受伤后留有大面积明显的痕迹
④
D.受伤害的严重程度与电流的种类有关
⑤
E.受伤害程度与电流的大小有关
随机题目
【单选题】
13. Where is my pen? I ______ it.
①
might lose
②
would have lost
③
should have lost
④
must have lost
【单选题】
14. I didn’thear the phone. I ______ asleep.
①
must be
②
must have been
③
should be
④
should have been
【单选题】
11. I thought you _____ like something to read, so I have bought you some books.
①
may
②
might
③
could
④
must
【单选题】
3. Few of them hurt themselves in the accident last night, ____ ?
①
but
②
and
③
though
④
so
【单选题】
9.The old farmer, ____the badly injured and burnt soldier, came out of the burning farmhouse, calling continuously for help.
①
supporting
②
having supported
③
being supported by
④
being supported
【单选题】
5.____the front door____, he had to enter the room through the back door.
①
Seen, painted
②
Seeing, painted
③
Being seen, being painted
④
Seeing, being painted
【单选题】
16. As I will be away for at least a year, I’d appreciate____ from you now and then so that I can know how everyone is getting along.
①
having heard
②
to hear
③
hearing
④
beingheard
【单选题】
7.He looked around and caught a man____his hand into the pocket of a passenger.
①
put
②
to be put
③
to put
④
putting
【单选题】
14.The thief fell to the ground，his left foot ____and blood ____down from his mouth.
①
breaking; running
②
broken; running
③
breaking; run
④
broken; run