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【单选题】
根据所传递指令的不同性质,还可分为主和副两种,副的作用是__________。
A.
作为主车钟的备用车钟
B.
传送与主车钟操纵有其他联络信息
C.
可和主轮换使用
D.
当主车故障才可用
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