多项选择题

共集电极放大电路的主要特点是（）。

A.电流放大倍数小于1
B.输出电压与输入电压相位相同
C.输出电压近似等于输入电压
D.输入电阻高
E.输出电阻小
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What parts does the gas chromatograph include? A、 Carrier gas system, detection system, separation system, sampling system. B、Carrier gas system, detection system, separation system, sampling system, temperature control system, data acquisition and processing system. C、Carrier gas system, detection system, separation system, sampling system, data acquisition and processing system. D、Carrier gas system, detection system, sampling system, data acquisition and processing system.
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半导体三极管区掺杂浓度最高。
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