电话机听筒上壳
upper cover of telephone receiver
在飞机上上网
connect to the Internet in flight
150CC以上机车
More Than 150CC Motorcycle
PLC在试验机上的应用
application of PLC to testing machine
安全壳壳体上的电缆贯穿件接头
connection on containment shell for cable penetration
变质上壳岩系
metamorphic supracrustal rocks