8031在使用外部数据存储器时，最多还有多少条通用I/O线可供用户使用？并说明原因。
M98表示（）。 ["调用子程序","关机","循环运算","返回上级目录"]
You need to remove any Microsoft Windows Internet Explorer 7 add-ons in Microsoft Windows Vista computers that do not have prior approval from the following authorities： Microsoft System manufacturer Service provider What should you do？ （） ["Remove any add-ons that are not found in the list of downloaded ActiveX controls.","Remove any add-ons that are not found in the list of add-ons used by Windows Internet Explorer 7.","Remove any add-ons that are not found in the list of add-ons that run without requiring permission.","Remove any add-ons that are not found in the list of add-ons that are at present loaded in Windows Internet Explorer 7."]
全国建筑市场的监管目标要求达到（） ["“数据一个库、监管一张网”","“监管一张网、管理一条线”","“数据一个库、管理一条线”","“数据一个库、监管一张网、管理一条线&rdquo"]
某人如果同时买入一份看涨期权和一份看跌期权，这两份合约具有相同的到 期日、协定价格和标的物，在投资者（） ["最大亏损为两份期权费之和","最大盈利为两份期权费之和","最大亏损为两份期权费之差","最大盈利为两份期权费之差"]
简述基金证券与股票、债券的区别与联系。
