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【简答题】
将 20 o C 的 30 m 3 /h 的流量从水池送至高位水箱,已知水箱内压强为 0.05 MPa (表压),水箱水面到水池水面的高差为 10 m ,输水管内径为 80 mm ,长 18 m ,管线局部阻力系数 ζ = 13 ,摩擦系数 ,求所需的泵的功率。已知水的粘度为 10 -3 Pa·s ,密度为 10 3 kg/m 3 。
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B.
伪造税务登记证件，且造成严重后果的
C.
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D.
不按规定办理税务登记，经责令改正，逾期仍不办理的
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you needn't
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you mustn't
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you can't
D.
you shouldn't
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【单选题】We'd better send the injured man to the hospital as as we can. [ ]
A.
more quickly
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quickly
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most quickly
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the most quickly
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