允许取空值但不允许出现重复值的约束是() A.NULL B.UNIQUE C.PRI 发布时间:2019-02-03 20:22 │ 来源:www.tikuol.com 题型:单项选择题 问题: 允许取空值但不允许出现重复值的约束是()A.NULLB.UNIQUEC.PRIMARYKEYD.FOREIGNKEY
题型:单项选择题 The critical path is established by calculating the following dates:A.Start-to-start, start-to-finish, finish-to-finish, finish-to-starB.Early start, early finish, late start, late finisC.Predecessor-to-successor, predecessor-to-predecessor, successor-to-successoD.Primary-to-secondary, primary-to-finish, secondary-to-secondary, finish-to-finis 查看答案
题型:单项选择题 阅读下面一段文字回答后面的问题。 “妈一定刚刚起床,可是我已经下班回来了,”他一面想着,一面加快脚步,嘴里吹着口哨。“离开学校倒也好。反正那个该死的神父是不会让你好好念书的,现在我恨不得吐那家伙一脸唾沫。”他正想着,已经到家了。(选自《钢铁是怎样炼成的》) (1)这段文字中的他是指作品的主人公________________________(2)结合原著中这段文字之外的相关内容,说说他为什么对神父如此愤恨。答:____________________________________________ 查看答案