题目内容

额定输出电流主要受两个方面约束,一个是调整元件的最大允许电流和最大充许耗散功率,另一个是要考虑输出电压的稳定性。 (2.0)

A. 对
B. 错

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稳压管稳压时是其工作在正向导通区 (2.0)

A. 对
B. 错

A: (1) _________________________________________B: She told her pupils to be quiet / not to talk.A: (2) _________________________________________B: They were told to get on with their work and not to be silly.

A: (1) _____________________________________B: He told / advised Jerry to try to avoid sugar.A: (2) _____________________________________B: He was told not to eat sticky sweets that stick to his teeth.

A:(1) __________________________B: She often asks them to turn the cassette recorder on / off.A: (2) __________________________B: They are often asked to turn the cassette recorder on / off.

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