质量流量的数据可借助于密度计而获得.Mass flow information can be secured by using a densitometer.定义密度计内设有样品时的密度为密度尺标的零点.The zero point of the density scale is defined by having no specimen in the densitometer.光学密度计是一种测量胶片感光性能的专用仪器.Densito...
劳拉松开离合器踏板，沿车道慢慢驶离。Laura let out the clutch and pulled slowly away down the drive.踏板似乎有点偏心，离合器也相当紧。The pedals seem a bit off-centre and the clutch is rather stiff.你的脚离开踏板，汽车便会熄火。Your foot falls off the pedal and you stall...