单项选择题
The meaning of slacken her speed is（）.
A.increase ship's speed B.slow down ship's speed C.make up ship's speed D.fix up shp's speed
单项选择题 The most important principle in the cargo stowage is（）.
单项选择题 The necessity of the segregation of cargoes is determined by（）.
单项选择题 The officer of the watch should（）comply with the collision rules.
