A.valve overlap
B.volumetric efficiency
C.turbulence of the air change
D.fuel efficiency
第1题
A.Ⅰ+Ⅱ
B.Ⅱ+Ⅲ
C.Ⅲ+Ⅳ
D.Ⅰ+Ⅳ
第3题
A.How they finished
B.How did they finished
C.That how they finished
D.That how did they finished
第4题
A.remove suspended and precipitated solids from the boiler water
B.completely drain the boiler in an emergency situation
C.prevent hardened scale deposits in the water drum
D.remove floating impurities from the oily water surface
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