单项选择题
The （）is out of order. We must have someone to repair it at once.
A.stevedore B.foreman C.derrick D.docker
单项选择题 Which hold shall we put all the cargo in?（）
单项选择题 The safe working load of the derrick is （）.
单项选择题 It’s going to rain. Don’t forget （）the hatches.
