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单选题
9、清洁表面,以确保粘接符合要求
A
Clean the surface to make sure that the bond is satisfactory.
B
Clean the surface to make sure that the sealing is satisfactory.
C
Clean surfaces to ensure the bonding required.
答案解析
正确答案：A
解析：
解析:注释: satisfactory 令人满意的,可靠的;require 需要。bonding 黏合; sealing 密封。
相关知识点：
清洁表面净，粘接才合格
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