单项选择题
On an oceangoing vessel，for each person a lifeboat (without desalting kits) is certified to carry，the boat must be supplied with（）.
A.2 pounds of condensed milk B.a signaling whistle C.3 litres of water D.a life preserver
单项选择题 On a lifeboat equipped with Rottmer-type releasing gear，turning the releasing lever releases（）.
单项选择题 Number 3 lifeboat would be（）.
单项选择题 Limit switches（）.
