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【单选题】
两摩擦表面间的膜厚比λ<1时,摩擦状态为A.
液体摩擦
B.
干摩擦
C.
混合摩擦
D.
边界摩擦
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举一反三
【单选题】Mineral deficiencies can often be detected by specific symptoms such as chlorosis(loss of chlorophyll resulting in yellow or white leaf tissue), necrosis(isolated dead patches), anthocyanin formation(...
A.
fight off
B.
show
C.
cause
D.
spread
【简答题】vi. think that sb. or their behavior, ideas, etc. are bad or wrong 不赞同;反对
【简答题】There’s a big difference between the amount required to pr deficiencies that would lead to serious degeneration, and the amount of each vitamin and mineral you need for optimum health
【简答题】mineral nutrition
【简答题】vt. officially accept a plan, proposal, etc. 批准;认可vi. think that sb. or sth. is good, right, or suitable 赞许;赞成;同意
【单选题】Which is not the cause of mineral form?
A.
chemical composition
B.
crystal structure
C.
crystallization environment
D.
colour of mineral
【单选题】Severe vitamin and mineral deficiencies can lead to mental ___________.
A.
chaos
B.
disorders
C.
confusion
D.
mix
【简答题】a_____ vt. officially accept aplan, proposal, etc. 批准;认可 vi. think that sb. orsth. is good, right, or suitable 赞许;赞成;同意
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