8,000 homes were plunged into darkness as electricity cables crashed down...由于电缆损毁，8,000户家庭顿时落入一片黑暗之中。The brochure offers a wide choice of hotels, apartments and holiday homes...这本小册子提供了很多宾馆、公寓、度假屋供选择。The only way to sol...
Getter - ion pumps decrease chamber pressure by chemical reaction of residual gases with an evaporated metal.吸气离子泵通过剩余气体与蒸发的金属之间的化学反应减少了内腔的压力.Recent electronic means of pumping using low temperature sorption techniques a...