题目内容

After the Arab states won independence, great emphasis was laid on expanding education, with girls as well boys _________________ to go to school.

A. to be encouraged
B.been encouraged
C. being encouraged
D.be encouraged

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The important news was heard _________ twice on the radio.

A.broadcasting
B. broadcast
C. to be broadcast
D.be broadcast

将二极管的正极接电路的（）电位，负极接（）电位，此时二极管正向偏置，二极管呈现较（）电阻，有较（）的电流通过，这种状态称为二极管的正向（）状态。

将二极管的正极接电路的（）电位，负极接（）电位，此时二极管反向偏置，二极管呈现较（）电阻，几乎没有电流通过，这种状态称为二极管的反向（）状态。

二极管的伏安特性是指加在二极管两端的（）大小和通过二极管的（）之间的关系。