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【多选题】
同一流体经过两根长度相同但粗糙度不同的等直径长直管道,当两者的雷诺数相同时,它们的盐城损失hf在以下哪些区域中是相同的A.
层流区
B.
层、紊流过渡区
C.
紊流光滑区
D.
紊流过渡区
E.
阻力平方区
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A.
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【单选题】-How can we keep our city clean. - _________.
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We can go to school on foot.
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We can go to school by bike.
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B.
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D.
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