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第1题

（ ）.微分方程y+2y=4x满足初始条件yx=0的特解为(本题4.0分) A、y=2x+1+e-2x B、y=2x-1+e-2x C、y=-2x+1+e-2x D、y=-2x-1+e-2x
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第2题

Earthquakes may rightly be ranked as one of the most destructive forces known to man: since records began to be written
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第3题

1、 Sleep is a funny thing. We’re taught that we should get seven or eight hours a night, but a lot of us get by just fin
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第4题

A.on B.at C.in D.during [ 2 分 ]
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