White smoke exhausting from an operating diesel engine may indicate （）.

[单选题]White smoke __________25～30 meters above the hill as they approached it.A． has been seen riseB． had been seen risingC． was seen riseD． was seen rising

[单选题]The possibility of damage from operating a diesel engine at critical speeds is reduced by the use of（）.A . an isochronous governorB . elastic engine mountsC . a vibration damperD . a cast iron bed plate with good flexible qualitie

[单选题]A． smoking exhaust from an operating diesel engine could be caused by( ).A．low sulfur content in the fuelB．a loose injector inlet connectionC．late fuel injectionD．high injection pressure

[单选题]B．lack and white must be ______from each other, must be unable to communicate.A． cut downB． cut outC． cut offD． cut up

[单选题]Mrs. White is different from her friends who were ______.A．easily satisfiedB．not always hopefulC．sure to succeedD．not interested in free food

[单选题]Compared with outcomes that result from collusion, independent action by co

[试题]Mr. White has been_____（缺席的）from work for days, so he knows nothing about our new plan.

[单选题]All else being equal, a company's cash flow from operating activities for 2

[单选题]To compile an [exhaustive]dictionary is an exhausting task.A.long and borin

[单选题]The discussion was so prolonged and exhausting that _____ the speakers stop