(单选题)
吊杆停用时,稳索必须要收起来。()
AWhen the derrick is stopped, the guy must be stowed.
BWhen the derrick is stopped, the guy must be topped.
CWhen the derrick is stopped, the guy must be lowered.
DWhen the guy is stopped, the derrick must be stowed.
正确答案
答案解析
略
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