单项选择题
A.keep the liferaft from capsizing
B.navigate against the current
C.keep personnel from getting seasick
D.stay in the general location
单项选择题 If you are sailing from the East Coast of the United States to the Caribbean Sea，which publication would contain information on weather，currents，and storms?（）
单项选择题 If the current and wind are in the same direction，the sea surface represents a wind speed （）.
单项选择题 If the current and wind are in opposite directions，the sea surface represents（）.