A.2min B.5min C.10min D.20min
A.起動(dòng)前卸載閥應(yīng)開(kāi)啟 B.起動(dòng)后應(yīng)由低至高減產(chǎn)中級(jí)泄放閥 C.停車前應(yīng)由高至低開(kāi)啟各級(jí)泄放閥 D.停車前應(yīng)由低至高開(kāi)啟各級(jí)泄放閥
A.減弱閥彈簧張力 B.降低轉(zhuǎn)速 C.限制泵閥升程 D.采用群閥或錐閥