单项选择题
A. discharged B. discharging C. to be discharged D. to discharging
After operation, you should （）the motor.A.startB.openC....
单项选择题After operation, you should （）the motor.
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
