下面哪个部件不属于挖掘机的液压系统()
A. hydraulic pumu
B. hydraulic cylinder
C. hydraulic valve
D. hydraulic breaker
一般的履带挖掘机中没有哪种部件()
A. idler cushion
B. track assy
C. hydraulic motor
D. transmission
挖掘机的英文名称为()
A. Scrapper
B. Road Roller
C. Excavator
D. Crane
下面哪个属于挖掘机的属具()
A. bucket
B. reaker hammer
C. hydraulic pump
D. valve