单项选择题
The force resulting from the earth’s rotation that causes winds to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere is called（）.
A.pressure gradient B.Coriolis effect C.aurora borealis D.ballistic deflection
单项选择题 When steering by autopilot,how often should the steering be checked?（）
单项选择题 （）is the act of allocating space to containers on board of a container ship in the order of the discharge ports.
单项选择题 According to the relevant regulation, lifeboat should be powered by（）.
