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问题 单项选择题

在口腔健康调查中由于调查对象的代表性差，导致调查结果与实际情况不符，这属于

A．随机误差

B．无应答偏倚

C．选择性偏倚

D．检查者之间偏性

E．检查者本身偏性

答案

参考答案：C

选择题

15. With the reform of educational system, the teachers_____school I worked before have greatly changed their way of teaching.

A．in whose

B．whose

C．in which

D．Which
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选择题

He disliked      to wait, and he expected the manager     him at once.

A．being asked; to see

B．to be asked; to see

C．to be asked; seeing

D．being asked; seeing
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