单项选择题
The bottom row of plating next to the keel of a lifeboat is known as the（）.
A.sheer strake B.bilge strake C.garboard strake D.keel rib
单项选择题 The backup system on an electric start survival craft is a（）.
单项选择题 Symptoms of sea sickness include（）.
单项选择题 Symptoms of heat stroke are（）.
