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【简答题】
滚珠丝杠副中滚珠的循环方式分为哪几类?试比较其结构特点。
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
举一反三
【简答题】斜齿轮通常在（）铣削加工。
【单选题】Directions: Now you will hear a passage. At the end of the passage, you will hear some questions. After you hear a question, choose the best answer from the four choices.
A.
Not to let kids keep or have cell phones.
B.
Not to allow kids to play outside for a week.
C.
To hit kids when they refuse to take our advice.
D.
To be firm but not too hard when teaching kids.
【简答题】什么叫码间串扰?它是怎样产生的?对通信质量有什么影响?