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【单选题】
什么叫软齿面齿轮?
A.
两齿轮中只要有一个齿轮硬度小于等于350HBS
B.
两个齿轮的硬度都小于等于350HBS
C.
两个齿轮的硬度都大于等于350HBS
拍照语音搜题，微信中搜索"皮皮学"使用
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【简答题】Questions11～13 are based on a piece of news about college admission in the USA．You now have 15 seconds to read Questions 11～13．根据听到的内容，回答1~3题According to the radio program，which one of the following f...
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【单选题】Questions11~15 are based on the following passageResearchers have shown that noise can adversely affect human in both physiological and psychological ways. Hearing losses in particular occupations suc...
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young people distinguish low frequency noise better than old people
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