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【单选题】
从两支手电筒射出的光,当它们照到同一点时看不到干涉花纹,是因为:
A.
手电筒射出的光不是单色光
B.
干涉图样太细小看不清楚
C.
周围环境的漫反射光太强
D.
两个光源是非相干光源
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【判断题】触电急救首先要使触电者尽快脱离电源。
A.
正确
B.
错误
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【判断题】Unfortunately,some managers have to return home for they cannot cope with the depression caused by culture shock.
A.
正确
B.
错误
【单选题】触电急救时首先要尽快地( )
A.
通知医生治疗
B.
通知供电部门停电
C.
使触电者脱离电源
D.
通知生产调度
【单选题】Woman: Some people know a lot more than they tell.Man: Unfortunately the reverse is also true.Question: What does the man imply?
A.
Some people tend to conceal the truth.
B.
Some people are prone to tell lies.
C.
Some people are dishonest.
D.
Some people tell a lot more than they know.
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