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生活的意义

金虫 (小有名气)

[求助] 求助,求解释,急

In this case, it was found that when the applied load was over a certain level, but the sliding speed was increased at that constant load, the wear rate of the pin specimen was increased suddenly at a certain critical speed.
applied load :滑动摩擦载荷, sliding speed :滑动摩擦速度
请解释一下。

为什么要用"but”?

[ Last edited by 生活的意义 on 2011-9-23 at 16:43 ]
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