已知x=1y=2和x=-1y=-3是方程2ax-by=4的两组解,求a、b的值.

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问题:

已知
x=1
y=2
x=-1
y=-3
是方程2ax-by=4的两组解,求a、b的值.
考点:二元一次方程的解法
题型:解答题

满足{1,3}∪A={1,3,5}的所有集合A的个数(  )

A.1个

B.2个

C.3个

D.4个

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1645年,()在湖北通县九宫山遭地主武装袭击而遇难。

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Americans value competition. They believe that competition      out the best in any individual. They claim that it challenges or even      each person to produce the very best that is humanly possible.     , the foreign visitor will see competition encouraged in the American home and in the American classroom,     at the youngest age levels. You may find the    placed on competition confusing, especially if you come from a society that promotes cooperation   competition among individuals. But Americans teaching in the Third World countries find the lack of competition in a classroom situation equally     . They soon learn that what they had thought to be one of the universal human qualities      only a particularly American or Western value.
小题1:
A.carriesB.bringsC.picksD.comes
小题2:
A.forcesB.causesC.leadsD.teaches
小题3:
A.ParticularlyB.OccasionallyC.ConsequentlyD.Accidentally
小题4:
A.evenB.stillC.onlyD.already
小题5:
A.thoughtsB.interestC.attitudeD.value
小题6:
A.together withB.rather thanC.in spite ofD.along with
小题7:
A.puzzlingB.unacceptableC.unfortunateD.discouraging
小题8:
A.encouragedB.respectedC.representedD.Produced
题型:解答题

建设工程要求地基及其一定区域内的地层有一定的强度、刚度、( )和抗渗性。

A.稳定性
B.烈度
C.抗滑性
D.黏聚性

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应收账款和预收账款都属于资产性质的账户。 ( )

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