Light fittings with metal parts should always be earthed.有金属部件的照明装置都应该走地线。Heavy Metal music really arose in the late 60s.重金属音乐真正形成于60年代后期。The car was left a mess of twisted metal.车子成了一堆扭曲的金属。...
The black mater metal plate is called a collector, there.这个黑色金属板叫做吸热器.In metal lubrication two distinct regions are recognized: boundary and hydrodynamic.在金属的润滑作用中存在两个不同区段: 边界和流体区.Getter - ion pumps decrease chamber pres...