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【多选题】
到英国人家做客时,忌讳送主人()。A.
有百合花图案的礼物
B.
短裙
C.
有大象图案的礼物
D.
有孔雀图案的礼物
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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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