如何保证游戏观察的有效性？
金融危机是金融风险的集中体现和极端形式。
慢性肺心病可能出现的并发症是（） ["肺性脑病","心律失常","水、电解质平衡紊乱","上消化道出血","以上都是"]
日本物语的鼻祖是：（） ["《源氏物语》","《竹取物语》","《凡人物语》","《平家物语》"]
Which of the following protocols uses both TCP and UDP ports?（） [" SMTP"," Telnet"," FTP"," DNS"]
虚拟团队
