單項(xiàng)選擇題

A.be safe if mixed with fresh water
B.prevent seasickness
C.promote urine excretion
D.protect against heat cramps

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A.survivors in the water
B.food and water
C.land
D.bad weather

A.12 to 15 times per minute
B.18 to 20 times per minute
C.20 to 25 times per minute
D.as fast as possible