单项选择题
The winch at hatch No.3 is（）trouble.
A.at B.in C.on D.over
单项选择题 The winch is liable（）worn-out in this way.
单项选择题 There are 65（）of grade No.3 rubber short.
单项选择题 There are salvage operations（）position 120.0N, 12.5E.
