试题与答案

通用型便携式固定装置工作负荷不小于13kn。

题型:判断题

题目:

通用型便携式固定装置工作负荷不小于13kn。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:因经初等行变换由A可得到B,故存在初等矩阵P1,P2,…,Ps使Ps…P2P1A=B. 对矩阵A,B按列分块,并记A=(α1,α2,…,αn), B=(β1,β2,…,βn),P=Ps…P2P1,则有P(α1,α2,…,αn)=(β1...

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A few years ago, when I was about 14,I went out for a walk 31  a rainy summer day. I saw a man 32 small, dirty colthes. He had 33umbrella, and he was picking bottles out of bushes. When he found 34 ,he smiled and put it in his big bag. I thought,“I wish there 35 some way to help him. Well, I could give him my umbrella.” Then I walked to him 36 gave the umbrella to him.“You need this more than I 37 .” The man took it with 38 big smile on his face and said,“Thank you! Thank you!” And then I walked away 39 good, I turned around and saw him 40a lot more, even though he was still picking bottles from bushes. “It was just an umbrella.” I thought, not 41 that it was the kindness 42 made him happy.
A few weeks later I was walking on a sunny day, and 43 the same man with the same clothes, 44 the same big bag 45 of bottles. The only 46 was that my umbrella was right in the corner, looking47 he cherished(爱护) it. It was so clean.
It didn’t 48 that I couldn’t give the man a house and a job and I only did I was able to do. But 50made someone else happier, so that was enough.
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A.inB.onC.atD.during
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A.wear B.dressC.withD.in
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