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9、按返回键退出当前Activity系统调用了finish方法
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单选题导致一个Activity的onDestroy（）方法被调用的原因是什么？（）A
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单选题当第二个Activity退出的时候需要返回一些信息给第一个Activity。那么在第一个Activity中接受返回数据的（）。A
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单选题An activity has an early start date-of the lOth and a late start date of the 19th. The activity also has a duration of 4 days. There are no nonworkdays. From the information given, （）what can be concluded about the activity?A
Total float for the activity is 9 days.B
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The late finish date is the 25th.D
The activity can be completed in 2 days ifthe resources devoted to it are doubled.
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