感染后，不出现或仅出现不明显的临床表现，但可发生特异性免疫反

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问题单项选择题

感染后，不出现或仅出现不明显的临床表现，但可发生特异性免疫反应，称为

A．病原体被消灭或排出

B．潜在性感染

C．病原携带状态

D．隐性感染

E．显性感染

答案

参考答案：D

单项选择题

Which of the following is closest in meaning to what you’ve just heard

A．I have no doubt that she will type her paper tomorrow.

B．No one believes that she is a good typist.

C．I didn’t know she had so many pages to type tomorrow.

D．It seems that she won’t be able to complete her typing by tomorrow morning.

单项选择题

（）是指采用立式深井泵的工程用消防泵。

A.供水消防泵

B.稳压消防泵

C.供泡沫液消防泵

D.深井消防泵