题目内容
若某计算机系统是由1000个元器件构成的串联系统，且每个元器件的失效率均为10-7/H，在不考虑其他因素对可靠性的影响时，该计算机系统的平均故障间隔时间为(15)小时。
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【B16】
【B2】
第二节 完型填空
阅读下面短文，从短文后所给各题的四个选项(A、B、C和D)中选出能填入相应空白处的最佳选项。
The old boots had bothered (烦扰) him so much that Johnny decided to throw them away. He went to the rubbish pit (坑)outside the town and【B1】the boots into the pit.
"Now I've【B2】got rid of them--and my【B3】, too! "he said to himself, quite【B4】. Then he returned home, lay down on his bed, and fell asleep.
【B5】he had a dog, for which Johnny cared little. It often made a journey as far as the rubbish pit, and 【B6】the pit to find something unusual. When it discovered to whom the heavy pair of boots had【B7】 , it 【B8】picked up one in his mouth and【B9】straight for home. The dog placed the boot, at its【B10】bedside, then hurried out to get back【B11】in the same way.
No sooner had Johnny woke up and【B12】the boots than【B13】filled his heart. 【B14】can walk by themselves and something must be done to end the matter, he thought.
Then he made a big fire in front of his house. He was 【B15】about to burn the boots in the fire when a strong wind began to blow. In no time the【B16】caught fire. 【B17】he had managed to 【B18】the neighbours to put out the fire, the house burnt down. But the boots were 【B19】again--by the old【B20】dog.
【B1】
某人购买了一张意外伤害险的保险单，保险金额为20万元，被保险人在保险期限内遭受一次意外伤害造成身体4个部位残废，每个部位的残废百分率分别是40%、50%、 60%、30%，保险人累计给付的保险金为()万元。
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