题目内容

It is reported that security has been _____ at the airport following the discovery of a bomb there.

A. bettered
B. enhanced
C. fastened
D. enriched

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Libraries, as well as labs, are _____ to the campus life of any college student.

A. central
B. integral
C. equal
D. important

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试述盘式制动器的拆装步骤。

如何判断机油变质?并说明变质产生的原因。

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