题型:问答题 简答题 The shippers hope each mate’s receipt is to be signed right after().A.the cargo is loadingB.the cargo is dischargedC.the cargo is on boardD.the cargo is damaged 查看答案
题型:问答题 简答题 有一垂直放置的渐缩管,内径由d1=300mm渐缩至d2=150mm,水从下而上自粗管流入细管。测得水在粗管1-1断面和细管2-2断面处的相对压强分别为98kPa和60kPa,两断面间垂直距离为1.5m,若忽略摩擦阻力,则通过渐缩管的流量为:()A.0.125m3/sB.0.25m3/sC.0.50m3/sD.1.00m3/s 查看答案