泵的抽气速率与气体的性质有关.Lashing velocity of pump is concerned with nature of air.现在已经采用了低温吸附技术和吸气离子泵的近代电子抽气设备.Recent electronic means of pumping using low temperature sorption techniques and getter - ion pumps have been introduce...
Several fishermen sat on wooden barrels, tending their nets.几个渔夫坐在木桶上修补渔网。Local fishermen's nets kept snagging on underwater objects.当地渔民的渔网老是被水下的东西钩住。The freighter fouled its propeller in fishing nets.货船的螺旋桨被渔网缠住了。...
气象学家认为这一气压的突然升高是暴风雨和飓风形成的物理机制.Meteorologist believe this pressure jump is the mechanism responsible for storm and tornado.速度上的差异就产生了气压的差异.This difference in speed produces a difference in air pressure.摘要从事异常气压的工作人员于工作压力下...