A.≤50PPm B.≤10PPm C.≤100PPm D.≤40PPm
A.≤0.2% B.≤1% C.≤0.5% D.≤0.6%
A.反應(yīng)器 B.風(fēng)機(jī) C.密封油 D.壓縮機(jī)