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单选题
439.ACM机( )ACM( )
A
定期补加滑油Regularly add lubricating oil
B
视情补加滑油Depending on the situation adding oil
C
使用空气轴承,无滑油supported by air-bearings,no need of oil lubrication
答案解析
正确答案：C
解析：
题目解析
ACM机( )ACM( )
A. 定期补加滑油Regularly add lubricating oil
B. 视情补加滑油Depending on the situation adding oil
C. 使用空气轴承，无滑油supported by air-bearings, no need of oil lubrication
答案: C
解析：题目中提到"ACM机"，结合选项内容可以推测ACM可能是指"空气循环机"，而答案C中提到了"使用空气轴承，无滑油"，这意味着ACM使用空气轴承技术，不需要润滑油来进行润滑，因此C是正确的答案。
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