单选题When the power is shut off, the wire（）Abecomes slackBcan not be paid out unless the brake is overhauled or recover wire unless manually operatedCwill be let out because the brake is out of workDmay be pay out due to no power
单选题
When the power is shut off, the wire（）
A
becomes slack
B
can not be paid out unless the brake is overhauled or recover wire unless manually operated
C
will be let out because the brake is out of work
D
may be pay out due to no power
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