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The journey two divers(潜水员)made some time ago to the very deepest point on the earth make us realize how much of the world still remains to be studied. The two men went down seven miles to the bottom of the Pacific Ocean inside a small ball to find out if there are any ocean currents(水流)or signs of life.

A.
if there are water currents and life in the great depths
B.
if people can stand the severe cold in the great depths
C.
if there are steps in the great depths
D.
if the telephone works well in the great depths
题目标签:潜水员水流
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【单选题】一输送热水的管道,其散热效果最佳的水流流态是()
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光滑区紊流
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过渡粗糙区紊流
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【单选题】潜水员必须系牢( )。
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