A.80m B.100m C.120m D.140m
A.2.5m B.4.5m C.6.5m D.8.5m
A."誰(shuí)使用、誰(shuí)保管、誰(shuí)維護(hù)檢驗(yàn)" B."專(zhuān)人保管、統(tǒng)一維護(hù)檢驗(yàn)" C."責(zé)任人保管、定期檢驗(yàn)" D."誰(shuí)使用、誰(shuí)檢驗(yàn)"