液压挖掘机挖掘控制系统[外文翻译],译文液压挖掘机挖掘控制系统masakazu haga ,watanabe hiroshi and kazuo fujishimahitachi construction machinery co ltd., tuchiura works, 650 kanadatsu-machi, tsuchiura-shi, ibaraki-ken 300-0013, japan received 4 january 2000; revised 27 april 2000; accepted 9 may 2000 available online 31 july 2001...