精确地预计弯头和管件的影响尚无方法可循.No methods are available for the accurate prediction of the effect of bends and fittings.我们常用弯头(管、兰、通、小关)为一种管件.We usually use elbow flangetee, reducer as a kind of pipe fitting.在人井2中,将弯头卸下,便于设备进入.Debu...
I didn't so much as catch sight of him all day long.我一整天都没见他人影。All day long I moved in a dream.整整一天我都心不在焉。You natter all day long at the hospital.你在医院白话了一整天。...