【单选题】下列关于活塞压气机排气温度的说法错误的是()。
A.
气缸用油润滑时,排气温度过高会使润滑油黏度降低及润滑性能恶化
B.
空气压缩机中,因排气温度高润滑油中轻质馏分容易挥发、裂解,会导致气体中含油增加,并容易出现积炭现象
C.
当使用一般压缩机油时,积炭与排气温度有关,温度在90~100℃之间时积炭现象最严重
D.
考虑到润滑油的润滑性能,氮氢气压缩机的排气温度一般限制在160℃以下
【单选题】______the timely rescue, a lot more people would have been killed in the earth-quake.
【多选题】下列哪几种疾病情况不宜行膀胱镜检查( )
【单选题】溃疡性结肠炎采用肾上腺皮质激素治疗,下列哪项正确
【简答题】Despite of taking more time to affect, which kind of organ is related to more serious effect on smokers?