水手英語(yǔ)甲板值班單項(xiàng)選擇題每日一練(2019.01.06)

來(lái)源：考試資料網(wǎng)

1 After operation, you should （）the motor.

2 When the derrick changes its （）(角度), its lifting capacity changes correspondingly.

3 The safe working load of the derrick is （）.

4 Bolts, nuts, split pins, hinges, wheels and stoppers should be frequently （）.

5 The running wheel runs along （）on top of the hatch coaming.