13-4、公式As=Aa/S=SaR( f P-1)/ ρ 0 中, ρ 0 和 f 分别代表的含义是( )。
A.
p 0 为入流污泥浓度, g/m 3 f 为溶解效率
B.
p 0 为出流污泥浓度, g/m 3 f 为溶解系数
C.
p 0 为入流污泥浓度, mg/m 3 f 为溶解效率
D.
p 0 为出流污泥浓度, mg/m 3 f 为溶解系数
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【单选题】Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because________.
A.
The direction of pressure on the journal in four-stroke engine is continuously
B.
positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine
C.
four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines
D.
Low-stroke engines usually consume less lube oil than four-stroke engines