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问题:

[单选] Dirt should not be allowed to contaminate a grease lubricant because the ().

A . dirt will cause corrosion of bearing
B . bearings will leak oil excessively
C . dirt is very abrasive when mixed with grease
D . grease will become inflammable

语言符号的意义和现实现象之间没有直接的联系。 什么是希尔反应? 日本的《绝唱》、《远山的呼唤》等影片属于抒情诗风格的道德题材影片。 建立信用村应具备的条件之一为辖内农户贷款面达()以上(根据当地实际,经省联社办事处批准可适当降低)。 30%。 40%。 50%。 35%。 According to the Sale Contract,it’s of FOB plus S.T.term.It’s quite obvious that(). our ship is not responsible for trimming and stowing。 our ship is responsible for trimming and stowing。 our ship is responsible for expenses。 our ship is not responsible for expense。 Dirt should not be allowed to contaminate a grease lubricant because the ().
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