结汇时的汇票通常一式两份，第一份为正本，第二份为副本，只有正本才有法律效力。
为链接定义目标窗口时，_blank表示的是（） [" 在上一级窗口中打开"," 在新窗口中打开"," 在同一个帧或窗口中打开"," 在浏览器的整个窗口中打开，忽略任何框架"]
亚硝酸还原酶，是以催化亚硝酸还原生成（）的氧化还原酶 ["NO","NO2","N2","HNO3","H2O"]
简述情商的具体心理内容。
You are creating an undo buffer that stores data modifications.You need to ensure that the undo functionality undoes the most recent data modifications first.You also need to ensure that the undo buffer permits the storage of strings only.Which code segment should you use？（） ["Stack<string> undoBuffer=new Stack<string>（）；","Stack undoBuffer=new Stack（）；","Queue<string> undoBuffer=new Queue<\/string><string>（）；","Queue undoBuffer=new Queue（）；"]
人身保险的特殊效用？
