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单选题
Repeat application of clean solvent as necessary to remove oils.
A
A.Use the clean solvent again to leave the oils on the surface.
B
B.If necessary, clean the oils by applying clean solution.
C
C.Remove the oils, if necessary, by applying clean solvent again.
答案解析
正确答案：C
相关知识点：
必要时重复用清洁溶剂除油
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