题型:判断题 Typhoon Morakot has caused great _________ to the local economies in Wenzhou.A.injuryB.woundC.ruinD.damage 查看答案
题型:判断题 如图所示一虹吸管,管径d=100mm,管长l=20m,沿程阻力系数λ=0.021,局部阻力系数=0.5,=0.15,若两水箱液面差ΔH=4.5m,则虹吸管可通过的流量为()L/s。A.25B.30C.35D.40 查看答案