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)
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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.