Anindicationofadieselengineairintakebeingpartiallyclogged,is（）.
A. lowfiringpressureandlowexhausttemperatures
B. lowfiringpressureandnormalexhausttemperatures
C. highfiringpressureandlowexhausttemperatures
D. highfiringpressureandhighexhausttemperatures
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商业银行不得销售以下哪些理财产品？（）
A. 无风险管控预案的理财产品
B. 不能独立测算的理财产品
C. 无市场分析预测的理财产品
D. 无风险评级的理财产品
Forproperoperation,auxiliaryboilerfeedwatermusthavewhichofthefollowingcharacteristics?（）
A. Highoxygenconcentration
B. LowpH
C. Properalkalinity
D. Alloftheabove
Themostcommoncauseofscaleformationinanauxiliaryboileris（）
A. concentrationsofcalciumsulfateintheboilerwater
B. fueloilinthefeedwater
C. impropertreatmentofthefeedwaterwithcalciumsulfate
D. excessivefeedwateralkalinity
Ifoveraperiodofweekstheair-boxpressureofaturbo-charged,dieselengine,operatingatfullload,appearstobedroppingoff,thecausecanbe（）.
A. openair-boxdrains
B. lossofcoolingwatertothediffuser
C. gradualfoulingoftheairfilters
D. improperlytimedexhaustvalves
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