后缸盖 meaning in Chinese

back cylinder cover
back cylinder head

Then a suction or a discharge valve in one of the two front , central and rear cylinders is removed respectively , the same measurement and analysis are performed . the results of different cases are compared with those under normal condition
文中设计了测试方案，分别用速度传感器和加速度传感器，同时测试压缩机前、上和后缸盖上的振动信号，并应用camd - 6100系统对其进行频谱分析。