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问题 单项选择题

我国现行饮用水卫生标准规定，总大肠菌群应为（）.

A.<10个/L

B.<3个/L

C.<10个/100ml

D.<3个/100ml

E.不得检出/100ml

答案

参考答案：E

单项选择题

按"铁路特殊岩土规程"，膨胀土及红黏土地区野外勘探时，不适合采用（）。

A.钎探

B.物探

C.钻探

D.挖探
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单项选择题

The passage suggests that ______.

A．one's intelligence is born by nature

B．people can be trained to make best use of their mental abilities

C．IQ tests are totally unreliable

D．most psychologists are in favor of the idea of "self-efficacy"
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