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【简答题】
在凸轮机构中,凸轮为 ,通常作等速 转动 。
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举一反三
【单选题】When enthusiasts talk of sustainable development, the eyes of most people glaze over. There is a whiff of sack-cloth and ashes about their arguments, which usually depend on people giving up the comfo...
A.
has brought about sustainable development.
B.
proves to be nothing but an imagination.
C.
will deprive most people of modern comforts.
D.
contributes to the environmentally sound development.
【判断题】OR 或 + 运算符 实现逻辑“与”组配,用来组配不同的概念的检索词。是一种概念相交和限定关系的组配。其基本作用是对检索范围加以限定,逐步缩小检索范围,提高检索结果的查准率。
A.
正确
B.
错误
【简答题】Most countries have four seasons: spring, summer, fall and winter. However, in some places, like Thailand, ther are only three seasons: summer, the "rainy season" and winter. A "rainy sseason" is a ti...
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