皮皮学,免费搜题
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搜题
【单选题】
数据库管理系统的功能 不 包括()。
A.
数据的安全性保护
B.
数据的完整性检查
C.
并发控制
D.
数据库概念设计
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举一反三
【单选题】I was in class at 3:00 p.m. yesterday.
A.
to study
B.
study
C.
studying
【判断题】“一带一路”建设的风险主要表现在地缘政治的风险、非传统安全的风险、传统安全的风险、法律和道德的风险、建设发展中的风险等五个方面。()判断对错
A.
正确
B.
错误
【简答题】(Para.3) And so it is with all major news stories. I remember when I was at primary school the teacher announcing pale-faced to a startled class of seven-year-olds President Kennedy is dead. I didn't ...
【单选题】下列物质中能透过滤纸不能透过半透膜的是
A.
生理盐水
B.
蛋白质
C.
泥浆
D.
牛奶
【单选题】事件A、B互不相容,其概率均不为0,则下列结论中肯定成立的是( ).
A.
A与B互不相容
B.
A与B互不相容
C.
P(B|A)=0
D.
P(B|A)=0
【单选题】对于事件A、B,下列命题正确的是( )。
A.
若A、B互不相容,则A与B也互不相容
B.
若A、B相容,那么A与B也相容
C.
若A、BX不相容,且概率都大于零,则A、B也相互独立
D.
若A、B相互独立,那么A与B也相互独立
【单选题】I was _____ in class at 3:00 p.m. yesterday. A. to study B. study C. studying
A.
to study
B.
study
C.
studying
【简答题】I first had physics lessons when I was in Grade Eight some years ago. In class, I 1 that there wasn’t a Nobel (诺贝尔) Prize winner from China. That made me sad, and I decided to change (改变) it. 2 after ...
【判断题】“一带一路”建设的风险主要表现在地缘政治的风险、非传统安全的风险、传统安全的风险、法律和道德的风险、建设发展中的风险等五个方面。
A.
正确
B.
错误
【简答题】I used to be a very self ­ centered person , but in the past two years I have really changed.I have started to think about other people 1 I think about myself.I am happy that I am becoming a 2 person....
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