單項(xiàng)選擇題Ships are always()on water and they are easy to rust.

A.float
B.floating
C.floats
D.floated


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

2.單項(xiàng)選擇題Speed must be regulated()no damage is done to the wharf.

A.in order to
B.so as
C.so that
D.such that

3.單項(xiàng)選擇題Stop()the derrick at once, the gooseneck is bent.

A.to use
B.to operate
C.maneuvering
D.using