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【判断题】
取样是指为某一特定目的,从某一物料或产品的总体物质中抽取部分具有代表性作为样品的操作。A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】函数f（x）= x -cosx在[0，+∞）内 （ ） A．没有零点 B．有且仅有一个零点 C．有且仅有两个零点 D．有无穷多个零点
【单选题】The writer thinks British drivers' behaviour to the misconduct of other drivers is too ______.
A.
timid
B.
unassertive
C.
tolerant
D.
aggressive
【单选题】My sister has been feeling ______ since she started her first job. She can’t sleep well.
A.
stressed
B.
unpleasant
C.
confident
D.
sudden
【单选题】No sooner _____ to sleep than the telephone rang once more.
A.
she went
B.
she had gone
C.
did she go
D.
had she gone
【单选题】Hardly ________ to sleep than it was time to get up again.
A.
she had gone
B.
did she go
C.
had she gone
D.
she went
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