问答题

蜂鸣器操作

答案：详见操作手册

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多项选择题

有意义的人生包括（）。

A.有信念的人生
B.有梦想的人生
C.有奋斗的人生
D.有奉献的人生

单项选择题

In most cases, which two of the three BJT terminal currents are approximately equal in value?

A．All currents are approximately equal.
B．collector current and emitter current
C．emitter current and base current
D．collector current and base current