题目内容

_____in health, he persisted in doing the experiment.

As he was poor
B. Poor was he
C. Poor as he was
D. Poor he was though

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He warned his son not to go into the forest alone because he was fearful_____some wild animals might hurt him.

A. if
B. that
C. whether
D. as

P型杂质半导体中的多子是。

在PN结外部施加电压使得P区电位（高于/低于）N区，即PN结处于（正偏/反偏），此时PN结处于导通状态。

在本征半导体中掺入杂质元素得到的杂质半导体中载流子浓度大幅提高，因此导电能力大幅增强。

A. 对
B. 错