单项选择题
The ()of the derrick is out of order.
A.black
B.back
C.block
D.broken
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单项选择题
Renew a cargo runner, please. ()
A.fall
B.stay
C.guy
D.sling
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单项选择题
We use TEU as the unit of the standard containers. Its length is().
A.40ft
B.20ft
C.20m
D.40m
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