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...
I abated his cringes, told him I forgave him.我止住了他那种卑躬屈节的神气, 告诉他,我饶恕了他.He always cringes before the boss.他在老板面前总是卑躬屈膝.However, I abated his cringes, told him I forgave him, and desired he might withdraw.可是我止住了他那种卑躬屈节的神气,...
Our constituency covers the city's poorest areas.我们的选区包括该城市最贫困的地区.In France, farmers are a powerful political constituency.在法国，农场主是强有力的政党支持群体。The constituency are voting tomorrow.选民明天投票.…the constituency with the la...