A.18 B.20 C.22
A.防止液壓管路振動 B.自動補償液壓油的體積變化，防止出現(xiàn)氣泡 C.防止液壓泵出口超壓
A.可燃?xì)怏w濃度≤LEL2% B.氧氣濃度≥21% C.可燃?xì)怏w濃度≤2%，氧氣濃度≥21% D.可燃?xì)怏w濃度≤LEL2%，氧氣濃度≥21%
