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投资者进行证券投资决策时，既要考虑证券的系统风险，也要考虑证券的非系统风险。 ( )
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甲公司承接了乙公司的网络建设工作。由于待建网络规模很大，为确保建设工作顺利进行，负责该项目的工程师在进行逻辑设计时提出了如下工作思路： ①明确逻辑设计工作的内容是：网络拓扑结构设计；物理层技术选择；局域网技术选择；广域网技术选择；地址设计：路由协议选择：网络管理模式与工具选择：撰写逻辑设计文档。 ②在进行地址设计时，确定的方案是：按乙公司各分支机构的地理位置划分地址块，并按10.n.X.Y/16的模式分配，其中n为分支机构的序号(0表示公司总部，分支机构总数不会超过200) 。 对该工程师确定的逻辑设计内容的评价，恰当的是 (27) 。 每个分支机构能连网的计算机的数量最多为 (28) ，配置IP地址时掩码是 (29) 。
如果不存在固定成本，边际贡献就等于息税前利润，息税前利润变动率就等于产销业务量变动率。 ( )
My grandfather used to have a beautiful gold pocket watch．He wore it on a fine gold chain across the front of his waistcoat，and when 1 was small he promised to leave it to me in his will．“When I’m gone，”he said，“this is going to be yours．”Unfommately that will never happen now．About three months ago，my grandfather came up to London to visit US．The first Sunday morningafter he arrived，my youngest son said he wanted to go to the park．“We’11 do better than that．”said my grandfather, "we’ll go and feed the pigeons in Trafalgar Square." So off they went. Theygot home about teatime and my grandfather was looking very upset. "My watch," he said, "it’sgone. Someone must have stolen it while we were feeding the pigeons.\ Where do they live They live in______
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