题目内容

A bipolar junction transistor ( BJT ) has terminals labeled base, collector, and emitter. For a field-effect transistor ( FET ) , the terminals are labeled gate , source, and drain, and a voltage at the gate can control a current between source and drain.

A. 基极
B. 发射极
C. 栅极
D. 漏极

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A diode is a two-terminal semiconductor device that consists of a PN junction made of semiconductor material.

A. 二极管
B. PN结
C. 材料
D. 半导体

An integrated circuit ( IC ) , sometimes called a silicon chip or chip, is a semiconductor wafer on which thousands or millions of tiny resistors, capacitors, and transistors are fabricated.

A. 晶片
B. 集成电路
C. 芯片
D. 制造

如果特殊系统存储器默认M1,则( )位首次扫描为1。

A. M1.0
B. M1.1
C. M1.2
D. M1.3

S7-1200 CPU上标识的DC/DC/Relay, 第一列DC为()。

A. CPU电源电压性质
B. 输入信号的电压性质
C. 输出信号的电压性质

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