单项选择题
A.start B.open C.stop D.turn on
Chief Officer, the cargo（）is broken.A.runnerB.runC.runn...
单项选择题Chief Officer, the cargo（）is broken.
A.runner B.run C.running D.runned
Wire ropes should be greased （）.A. every monthB. every ...
单项选择题Wire ropes should be greased （）.
A. every month B. every two months C. every three months D. A or B
The （）of the derrick is 5 tons.A.GTB.SWLC.DWTD.TDW
单项选择题The （）of the derrick is 5 tons.
A.GT B.SWL C.DWT D.TDW
