A. rat guardsB. stopping guardsC. fendersD. planksPut t……

单项选择题We should （）the national flag when the sun rises.

A.hoist
B.hoists
C.hoisting
D.hoisted

单项选择题The main tasks for sailors on duty are, first of all,（）the persons who come on board to do their business.

A.received
B.receives
C.receiving
D.receive

单项选择题Where are （）goods carried on board?

A.danger
B.dangerous
C.A+B
D.A or B

单项选择题（）social instruction on cargo securing.

A.Has
B.Had
C.Have
D.Having

单项选择题Go （）this ladder and walk aft.

A.down
B.to
C.up
D.in