Which two operations require undo data？（） ["committing a transaction","rolling back a transaction","recovering from failed transactions","recording a transaction to redo log files","rolling forward during instance recovery"]
管道组装完毕，应及时的分段下沟，非特殊地形宜（）为一段。 ["1km","5km","10km","15km"]
Given： What is the result？（） ["2","24","234","246","2346"]
You completed your Java procedure for your external Java function activity, and you now want todeploy this to your server. What would you do to deploy the Java procedure?（） [" take the Java sources (.java) files and include them in your $APPL_TOP"," take the Java sources (.java) files and include them in your CLASSPATH"," take the Java classes (.class) files and include them in your $APPL_TOP"," take the Java classes (.class) files and include them in your CLASSPATH"]
从伙伴关系角度看，影响儿童游戏的因素主要包括（） ["伙伴穿着","有无伙伴","伙伴的熟悉程度","伙伴年龄","伙伴性别"]
市场集中度
