皮皮学，免费搜题
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【单选题】
一对圆柱齿轮，通常把小齿轮的齿宽做得比大齿轮宽一些，其主要原因是
A.
便于安装，保证接触线长度
B.
使传动平稳
C.
提高传动效率
D.
提高齿面接触强度
拍照语音搜题，微信中搜索"皮皮学"使用
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【单选题】关于域名系统说法错误的是 。
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The role of supermarkets in the coffee business.
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相关题目：
【简答题】在实验中,用 测量吊环的内径和外径。
查看完整题目与答案
【单选题】在海运情况下，（）是发货人托运货物的原始依据。
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【单选题】关于域名系统说法错误的是 。
A.
域名由若干标号序列组成
B.
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B.
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C.
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D.
The advertising of a new product.
查看完整题目与答案
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