学习动机对学习行为的动力作用表现在() ["行为的激活","行为的定向","行为的维持","行为的强化"]
电力系统在很小的干扰下,能独立地恢复到它初始运行状况的能力,称为()。 ["初态稳定","静态稳定","系统的抗干扰能力"]
Which code fragment, inserted at line 23, allows the code to compile?() ["df = new DateFormat();","df = Date.getFormat();","df = date.getFormat();","df = DateFormat.getFormat();","df = DateFormat.getInstance();"]
Which tasks can be accomplished using the Enterprise Manager Support Workbench in Oracle Database 11g?() [" Generate reports on data failure such as data file failures."," You can track the Service Request (SR) and implement repairs."," You can package and upload diagnostic data to Oracle Support."," You can manually run health checks to gather diagnostic data for a problem."]
《中华人民共和国电子签名法》经全国人大常委会表决通过的时间是() ["2005年1月28日","2005年4月1日","2004年8月28日","2004年10月28日"]
轴承合金由于本身()较低,故通常都将它浇铸在()、()或()的轴瓦基体上。