社会学的研究方式有哪些？
1968年，成都军区军训部为购买一辆自行车给成都五金公司负责人写了一封信：“五金公司负责同志：战部需购自行车一辆请协助解决，此致”。这封信反映的时代背景是（）。 ["部门交流频繁，行政效率较高","国家全力备战，民政服务军事","经济体制僵化，生活物资紧缺","阶级斗争为纲，取消商品流通"]
After you have restored and recovered a database to a new host by using a previously performed Recovery Manager (RMAN) backup, which is the best option you would consider for the new database?（） [" Opening the database in RESTRICTED mode"," Opening the database with the RESETLOGS option"," Setting a new DBID for the newly restored database"," Restoring the server parameter file (SPFILE) to the new host"]
与Sun SPARC Enterprise M4000相比，哪一款POWER Systems服务器性能即可胜出？（） ["POWER520即可","需要POWER550","需要POWER570","需要POWER595"]
宏病毒可以感染后缀为（）的文件 ["exe","txt","pdf","xl"]
西餐是（）各国菜肴的总称。西餐的午晚餐不论是宴会还是便餐，大致由头盆、汤、（）、（）、（）组成。
