下列选项属于企业所得税的纳税人的是（）。 ["国有企业","私营企业","联营企业","股份制企业"]
Which three connection options are available when configuring a switch port to be part of a privateVLAN? （）(Choose three.) [" isolated mode"," switchport mode"," modular mode"," community mode"," promiscuous mode"," global mode"]
下面（）的主页地址是有效的。 ["www：\/\/www.sina.com.cn","http：\/\/\/www.sina.com.cn","http：\\\\www.163.net\\infor.htm","ftp：\/\/www.163.net"]
证券投资组合不是投资者随意的组合，它是投资者权衡投资收益和风险后，确定的最佳组合。
综合重合闸装置的阻抗选项元件一般均采用（）接线方式，当单相接地故障时，测量阻抗是（）。
简述负债管理的优缺点。
