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（一）2000年9月15日，甲公司向乙公司发出一份定购手机的要约，并要求乙公司在2000年10月10日之前答复，2000年10月初，该种手机的市场价格大幅度下跌，甲公司通知乙公司：“前次订单中所列货物价格作废，如你公司愿意降价20%，则要约有效期延长至10月20日。”乙公司收到通知后，立即于10月3日回信表示不同意降价，同时对前一订单表示接受，正常情况下，此信可以在10月8日到达，但由于邮局工人罢工，甲公司于10月15日才接到回信，立即答复：“第一次的订单已经撤销，接受无效。”乙公司立即回复坚持第一次的订单不能撤销。甲公司于10月20日又发函认为乙公司的承诺已经逾期，合同没有成立。请回答下列问题： 设乙公司在10月3日发出的信中表示同意降价5%，则此信（）
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（三） 背景资料 某装饰公司承接了寒冷地区某商场的室内、外装饰工程。其中，室内地面采用地面砖镶贴，吊顶工程部分采用木龙骨，室外部分墙面为铝板幕墙，采用进口硅酮结构密封胶、铝塑复合板，其余外墙为加气混凝土外镶贴陶瓷砖。施工过程中，发生如下事件： 事件一：因水龙骨为甲供材料，施工单位未对木龙骨进行检验和处理就用到工程上。施工单位对新进场外墙陶瓷砖和内墙砖的吸水率进行了复试，对铝塑复合板核对了产品质量证明文件。 事件二：在送样待检时，为赶计划，施工单位未经监理许可就进行了外墙饰面砖镶贴施工，待复验报告出来，部分指标未能达到要求。 事件三：外墙面砖施工前，工长安排工人在陶粒空心砖墙面上做了外墙饰面砖样板件，并对其质量验收进行了允许偏差的检验。 问题 事件一中，外墙陶瓷砖复试还应包括哪些项目，是否需要进行内墙砖吸水率复试铝塑复合板应进行什么项目的复验
（二）值此“神舟”五号载人飞船搭载着第一名中国航天员圆满完成太空飞行之际，世界的目光都在关注着中国。对此，有关人士纷纷评论说，“神舟”五号飞船的飞行成功，不仅使中国成为全球第三个载人航天国家，而且更象征着世界航天的新格局正在形成。 “神舟”五号载人飞船搭载着第一名中国航天员圆满完成太空飞行。这名航天员是（ ）
案例分析题A Pay Rise or Not"Unless I get a rise, I’ll have a talk with the boss, Henry Manley," George Strong said to himself. George liked his job and he liked the town he lived in, but his wife kept telling him that his pay was not enough to meet the needs of the family. That was why he was thinking of taking a job in Birmingham, a nearby city about 50 miles away. He had been offered a job in a factory there, and the pay was far better.George lived in Wyeford, a medium-sized town. He really liked the place and didn’t like the idea of moving somewhere else, but if he took the job in Birmingham, he would have to move his family there.Henry manley was the manager of a small company manufacturing electric motors. The company was in deep trouble because, among other reasons, the Japanese were selling such things at very low prices. As a result, Manley had to cut his own prices and profits as well. Otherwise he would not get any orders at all. Even then, orders were still not coming in fast enough, so that there was no money for raises(加工资)for his workers. Somehow, he had to struggle along and keep his best workers as well. He sighed. Just then the phone rang.His secretary told him that George Strong wanted to see him as soon as possible. Manley sighed again. He could guess what it was about. George Strong was a very young engineer. The company had no future unless it could attract and keep men like him. Manley rubbed his forehead（前额）; his problems seemed endless. George Strong was a very creative engineer.（）
共焦腔的菲涅耳数正比于镜的面积与镜面上光斑的面积之比，菲涅耳数越大，单程衍射损耗越（）。
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