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单选题
涂抹两层保护剂，以防止液压油损害密封胶。
A
Apply two films of protective compound to prevent hydraulic fluid from damaging to the sealant.
B
Apply two layers of protective compound to prevent hydraulic fluid damage to the sealant.
C
Two coats of sealing compound should be applied to prevent hydraulic fluid damage from the sealant.
答案解析
正确答案：B
相关知识点：
保护剂涂抹防油害考点
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