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水塔供水系统，管路总长L(m)(包括局部阻力在内当量长度)，1-1'到2-2'的高度H(m)，规定供水量V(m 3 ·h -1 )。当忽略管出口局部阻力损失时，试导出管道直径d的计算式。若L=150m,H=10m,V=10m 3 ·h -1 ,λ=0.023，求d。
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【简答题】Before marriage, younger Americans date each other, that is, they often go out together. Casual dating usually begins in the early s, and in the late s a _______ of steady dating develops. The...
【简答题】听力练习, 填空,注意单词或者短语的正确形式 Before marriage, younger Americans date each other, that is, they often go out together. Casual dating usually begins in the early s, and in the late s a __ 1 _____ of s...
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