Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will ().
A. reduce engine horsepower output
B. aid in silencing the exhaust noise
C. increase the mean effective pressure
D. contribute to effective cylinder scavenging
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每个吊车梁标高应测()点。
A. 2个
B. 3个
C. 4个
D. 5个
吊车梁校正时,校正()指标。
A. 3个
B. 4个
C. 5个
D. 6个
下列选项中,()最适宜作盆栽蝴蝶兰的基质。
A. 苔藓
B. 沙土
C. 粗砂
D. 黏土