A.一類土即松軟土B.二類土即普通土C.三類土即堅(jiān)土D.四類土即砂礫堅(jiān)土
A.眼面部防護(hù)裝置B.耳部防護(hù)裝置C.主動(dòng)降溫裝置D.電感應(yīng)裝置E.頭部防護(hù)裝置
A.插接B.拴接C.鉚接D.焊接E.栓接