皮皮学，免费搜题
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【单选题】
设S={1,2,3},图中2-2中给出了S上的两个二元关系R1,R2,则乘积 是A.
自反的
B.
传递的
C.
对称的
D.
等价的
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】链传动中，当链节距p增大时，优点是______，缺点是______。
【简答题】链传动中，当节距P增大时，优点是（），缺点是（）
【单选题】(Let's not) waste time on (matters of no important). We have other (vital) problems to (deal with).
A.
Let's not
B.
matters of no important
C.
vital
D.
deal with
【单选题】(Let's not) waste time on matters (of no important). We have other (vital) problems to (deal with).
A.
Let's not
B.
of no important
C.
vital
D.
deal with
【单选题】(Let's) not waste time on (matters of no important). We have other (vital) problems to (deal with).
A.
Let's
B.
matters of no important
C.
vital
D.
deal with
【单选题】(Let's not) waste lime on (matters of no important). We have other (vital) problems to (deal with).
A.
Let's not
B.
matters of no important
C.
vital
D.
deal with
【单选题】By 'critical times' (para. 2) the author means ______.
A.
important stages in the child's development
B.
difficult periods in the child's life
C.
times when mothers often neglect their children
D.
moments when the child becomes critical towards its mother
【单选题】链传动中,当链节距p增大时,优点是( ),缺点是( )。
A.
运动平稳性变好，承载能力变差
B.
承载能力增加，运动平稳性变差
C.
结构更紧凑，承载能力变差
D.
多边形效应改善，承载能力变差
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