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单选题
The lower seal comes into view when you pull the lower bearing down.
A
The lower seal appears as the lower bearing is pulled down.
B
You can see the lower seal before pulling the lower bearing down.
C
Only after you pull the lower seal down can you see the lower bearing.
答案解析
正确答案：A
相关知识点：
下拉下轴承可见下密封
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