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【单选题】
在船上采用凸轮式主令控制器实现零位保护的原理是_______。
A.
主令控制器必须从零位开始才能操作
B.
主令控制器开始只有在零位时，接通零压继电器，其常开触点闭合接通控制电路电源
C.
主令控制器如果开始不在零位时无法操作
D.
主令控制器本身从结构上就有零位保护功能
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