第二节One possible version:When everything was done on the computer, I appreciatedmy work proudly. Then I watched both poems passing through theprinter, the white paper coloring with words that shaped mychildhood. These poems reminded me of my childhood that mydad spent with me. I felt that this was a gift that my dad wouldtruly appreciate, though it was cheap I was looking forward tothe dayMy dad s birthday soon arrived, and our family sat together tocelebrate it. I took out my gift and passed it to my dad. The minuteI saw the look on my dad's face as he opened those letters carefullyplaced in a cheap frame, I knew I had given the perfect gift. Mydad hugged me and said this was the best gift that he had receivedand thanked me for remembering the wonderful moments that weshared together, and we recited the poems together

19解析】()系统不需要维修的舰率为·(是)·是+((是)一.………………3分(2)设X为维修的系统的个数,则x~B(,2),且=50x所以PF0=Px=4)=,(号)…(是)k=012…所以日的分布列为05001001500P16分所以的期望为E(=0×+500+100×0+1500×8=750.……………………7分(3》当系统G有5个电子元件时,原来3个电子元件中至少有1个元件正常工作,G系统才正常工作若前3个电子元件中有1个正常工作,同时新增的两个必须都正常工作,则率为C…号·(是)·p一p,若前3个电子元件中有两个正常工作,同时新增的两个至少有1个正常工作,概率为(·(号)·}·…p、(-D+·(是)·p=(2p-p)若前3个电子元件中3个都正常工作,则不管新增两个元件能否正雷工作,系G均能正常工作,率为q·()-所以新增两个元件后系G能正常工作的氧率为量十(pp)+=p+},手是由P+}-1-(2-1,当3一D>0时,即号 <曰时,可以提高整个g系统的常工作概率,”“< p>

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