Forproperoperation,auxiliaryboilerfeedwatermusthavewhichofthefollowingcharacteristics?（）
A. Highoxygenconcentration
B. LowpH
C. Properalkalinity
D. Alloftheabove
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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
非保本浮动收益的理财产品，适合（）投资者。
A. 保守型
B. 稳健型
C. 谨慎型
D. 进取型
Excessivealkalinityofthewaterinanauxiliaryboilercancause（）.
A. causticembrittlementoftheboilermetal
B. acidiccorrosionoftheboilermetal
C. hardscaledepositsontheboilertubes
D. etchingoftheheatexchangesurfaces
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