单项选择题

伸舌习惯易造成

A．牙列拥挤
B．深覆合
C．前牙开合
D．后牙反合
E．偏合

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不定项选择

若空间区域关于变量对称，即，且，则三重积分

A．错误
B．正确

问答题

There are four maxims in CP: maxim of [填空1], maxim of [填空2], maxim of[填空3], and maxim of [填空4]. The first maxim makes sure what we say is as informative as required, the second means we do not say what we believe to be false, the third means what we say is relevant to the topic and the last means that we express ideas in a clear and orderly manner.

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