A.前保險(xiǎn)杠B.后保險(xiǎn)杠C.前后保險(xiǎn)杠D.前或后保險(xiǎn)杠
A.污染環(huán)境B.使排氣凈化裝置失效C.增加發(fā)動機(jī)磨損D.易使發(fā)動機(jī)發(fā)生爆燃
A.101B.102C.103D.104