单项选择题
Survival craft EPIRBs (Class S) are（）.
A.permanently mounted in the survival craft B.portable and stowed for carriage to the survival craft C.permanently mounted on the bridge wings D.portable and stowed in the emergency gear locker
单项选择题 Proper GMDSS watchkeeping includes（）.
单项选择题 Our ship（）with many modern navigational instruments.
