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...
He lives on a cattle ranch in Australia.他在澳大利亚靠一个牧牛场为生。On his ranch in Crawford, Texas, the President keeps longhorn cow named Ofelia.在他得克萨斯州Crawford农场, 布什总统养着一头名叫Ofelia的长角牛....an old ranch house that has been converted ...
Nobody told y'all light - skinned dudes ain't in style no more?没人告诉你们已经不流行浅肤色了 吗 ?You dudes is froze out, especially after what happened last time.你们不能去, 特别是上次的事发生之后.Rude dudes will be kicked out of the game.不遵...