问题
单项选择题
制动缸活塞组装前，制动缸体内壁、活塞、皮碗须涂抹（）。
A.7057硅脂
B.89D制动缸脂
C.润滑油
D.120型阀用改性甲基硅油
答案
参考答案：B
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制动缸活塞组装前，制动缸体内壁、活塞、皮碗须涂抹（）。
A.7057硅脂
B.89D制动缸脂
C.润滑油
D.120型阀用改性甲基硅油
参考答案：B
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