A.泵 B.電磁閥 C.濾網(wǎng) D.雙向閥
A.5.0% B.4.0% C.2.2% D.1.2%
A.用木榔頭打擊輪使其松動(dòng) B.突然啟動(dòng)龍帶電機(jī) C.用松銹劑等化學(xué)藥品噴涂龍帶表面 D.更換失效軸承