单项选择题
A.under no conditions
B.at a maximum rate of two ounces per day
C.if gathered during or immediately after a hard rain
D.after mixing with an equal quantity of fresh water
单项选择题 Once you have established the daily ration of drinking water in a survival situation，how should you drink it?（）
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（）.
单项选择题 On a lifeboat equipped with Rottmer-type releasing gear，turning the releasing lever releases（）.