Please swing the derricks to （）.

单项选择题Please swing the derricks （）wharf side.

A.to
B.in
C.at
D.for

单项选择题（）we swing the port derrick inboard?

A.Shall
B.Are
C.Is
D.Be

单项选择题（）is the rate of discharging here?

A.When
B.Why
C.What
D.Either A or B

单项选择题The （）of the derrick is out of order.

A.black
B.back
C.block
D.broken

单项选择题Renew a cargo runner, please. （）

A.fall
B.stay
C.guy
D.sling