【简答题】The water is flowing in a 300-mm-diameter pipe with length l=120mm. the pressure drop from starting to ending is The water discharge in the pipe is . Determine the frictional coefficient.
【简答题】在所有旅游收入中储蓄量及用于进口和其他对外支付的数量越大,乘数效应也就越()。
【简答题】These are ideal rooms.(改为单数句子) This is_______ ideal_______ .
【简答题】在所有旅游收入中储蓄量及用于进口和其他对外支付的数量越大,乘数效应也就越 _____ 。