【单选题】
下图中（）是电动机正反向启动（按钮联锁）控制线路电气原理图。<br /> <img src="https://nimg.ppkao.com/2017-07/xieqiushi/2017070715092041379.jpg?sign=5eb9a613047174d3d3b94b26d7816a6c&t=62d3360a" /><br /> <img src="https://nimg.ppkao.com/2017-07/xieqiushi/2017070715092963457.jpg?sign=cf3a36b76903f430f4b04ad4356548fd&t=62d3360a" /><br /> <img src="https://nimg.ppkao.com/2017-07/xieqiushi/2017070715093870466.jpg?sign=355660b808c019b5e7f64722aab1bb07&t=62d3360a" /><br /> <img src="https://nimg.ppkao.com/2017-07/xieqiushi/2017070715094782313.jpg?sign=c9e6d109a4a2b05ed54bfc36ff81f225&t=62d3360a" />
A、A
B、B
C、C
D、D
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