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单选题
确保零件或表面层干燥且无污染。
A
Make sure that the parts or surface layer are dry and free from uncontamination.
B
Make sure that the parts or surface layer are dry and free from contamination.
C
Make sure that the parts or surface lamination are dry and free from contamination.
答案解析
正确答案：B
相关知识点：
确保零件或表面干燥无污染
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