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单选题
The lower seal comes into view when you pull the lower bearing down.
A
A.The lower seal appears as the lower bearing is pulled down.
B
B.You can see the lower seal before pulling the lower bearing down.
C
C.Only after you pull the lower seal down can you see the lower bearing.
答案解析
正确答案：A
解析：
这道题考察对英语句子的理解能力，需要理解句子中的逻辑关系，正确理解句子的意思才能选择正确答案。
相关知识点：
下拉下轴承，下密封可见
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