单项选择题
Seawater may be used for drinking（）.
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
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相关考题
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单项选择题
Once you have established the daily ration of drinking water in a survival situation，how should you drink it?（）
A.Small sips at regular intervals during the day
B.The complete daily ration at one time during the day
C.One-third the daily ration three times daily
D.Small sips only after sunset -
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（）.
A.the painter
B.the after boat fall only if the boat is waterborne
C.both falls at the same time only if the boat is waterborne
D.both falls at the same time even if the boat has not reached the water
