【单选题】
下图中（）是电动机单向直接启动控制线路电气原理图。<br /> <img src="https://nimg.ppkao.com/2017-07/xieqiushi/2017070715025823054.jpg?sign=d85b2e1b6e7a2f214781eda71eb79ccb&t=62d0a8e2" /><br /> <img src="https://nimg.ppkao.com/2017-07/xieqiushi/2017070715030955766.jpg?sign=7e552d6875272bc7f701630483684738&t=62d0a8e2" /><br /> <img src="https://nimg.ppkao.com/2017-07/xieqiushi/201707071503184053.jpg?sign=10c6b07b007100995e08d42fcca90182&t=62d0a8e2" /><br /> <img src="https://nimg.ppkao.com/2017-07/xieqiushi/2017070715033096031.jpg?sign=0935e86323798bb32fbaed320e9348ac&t=62d0a8e2" />
A、A
B、B
C、C
D、D
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