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【判断题】
在对不同富裕程度地区的人民进行关于幸福程度的问卷的时候,如果只是问他们幸福和不幸福,必须加上一个量化的条件,才有可能做得出幸福与否的结论。( )A.
正确
B.
错误
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举一反三
【单选题】With respect to the flow of lubricating oil through a diesel engine, the lube oil coolers are located after filters in order to _____.
A.
allow filtration of less viscous oil
B.
decrease the pressure drop across the filter
C.
improve overall filtration
D.
all of the above
【单选题】The function of lubricating oil is to ___.
A.
reduce friction between moving surfaces
B.
provide even distribution of bearing wear
C.
reduce the accumulation of harmful detergents
D.
maintain a constant oil temperature output at each bearing
【单选题】If the detergent type lubricating oil being used in a diesel engine is black, the oil ___________.
A.
must be centrifuged
B.
must by filtered
C.
must be changed
D.
is holding finely dispersed carbon in suspension
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