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Do you still smoke?____,It's two years since I smoked."A No,I don't.B Yes I do .C Not too much .D Oh yes,but I wish I didn't.请问为什么要选A, 英语

不选B?后面一句不是说抽烟已

----I haven't seen Jack for three days.Is he ill?----____.His mother told me that he was in hospital.A.I am afraid so B.I hope not C.I 英语

don't expect D

I don’t remember when and where I __ this umbrella. A. buy B. have bought C. will buy D. boughtI don’t remember when and where I _ 英语

this umbrella

I won't sleep until mother_(come)back I won't go to see the film tonight because I (lose) the 票I won't sleep until mother_(come)ba 英语

k I won't go t

I don't suppose anyone will volunteer,A.do I B.don't I C.will they D.won't they 为什? 英语

(33)设关系 R 和S 的元数分别是r 和 s,则集合{t | t = < t r,t s>S }标记的是 A)R ? S B)R

（33）设关系 R 和S 的元数分别是r 和 s，则集合{t | t = < t r，t s>S }标记的是A）R ? SB）R—SC）R ? SD）R ? S

设关系R与关系S具有相同的目,且相对应的属性的值取自同一个域,则R∩S可记作A.{t|t∈R∨t∈S}B.{t|t∈R

设关系R与关系S具有相同的目,且相对应的属性的值取自同一个域,则R∩S可记作A．{t|t∈R∨t∈S}B．{t|t∈R∧tS}C．{t|t∈R∧t∈S}D．{t|t∈R∨tS}

设关系R与关系S具有相同的目,且相对应的属性的值取自同一个域,则R∪S可记作A.{t|t∈R∨t∈S}B.{t|t∈R

设关系R与关系S具有相同的目，且相对应的属性的值取自同一个域，则R∪S可记作A．{t｜t∈R∨t∈S}B．{t｜t∈R∧t￢∈S}C．{t｜t∈R∧t∈S}D．{t｜t∈R∨t￢∈S}

在传统的集合运算中,关系R和关系S的差的结果可表示为(t表示元组)______。A.{t|t∈R∨t∈S}B.{t|t∈R∧t

在传统的集合运算中，关系R和关系S的差的结果可表示为(t表示元组)______。A．{t|t∈R∨t∈S}B．{t|t∈R∧t∈S}C．{t|t∈R∨t∈S}D．R-S

对于纯电阻电路：已知：I、U，求：R=P=已知：R、U，求：I=P=已知：I、R，求：U=P=已知：P、U，求：I=R=已知：P、I，求：U=R=已知：P 物理

__ R=______已

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