4．June Ist is __________．A． April Fool’s DayB． Women’ s DayC． Children’s DayD． National Day
4．June Ist is __________．
A． April Fool’s Day
B． Women’ s Day
C． Children’s Day
D． National Day
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对因果系统,只要判断H(s)的极点,即A(s)=0的根(称为系统特征根)在平面上的位置,即可判定系统是否稳定。下列式中对应的系统可能不稳定的是________。 A.s*s*s+4s*s-3s+2B.s*s*s+4s*s+3sC.s*s*s-4s*s-3s-2D.s*s*s+4s*s+3s+2
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There are some new books in the school library．They are__books.A.childB.childrens'C.childrenD.children's
In some libraries young people can check out ten juvenile books at one time.A:adventureB:large-printC:hardcoverD:children's
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