2. 外语
  3. Even before modern notions of friction, it was known that greased surfaces move over one another more easily than dry ones.

Even before modern notions of friction, it was known that greased surfaces move over one another more easily than dry ones.

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问题 Even before modern notions of friction, it was known that greased surfaces move over one another more easily than dry ones.
选项 A、concepts
B、tricks
C、benefits
D、techniques
答案A
解析
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