【判断题】【消耗次数：1】
数据的安全性是指保护数据以防被盗。
①
正确
②
错误
参考答案：
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相关题目
【简答题】
简述数据库的安全性，有哪些具体的安全性措施？
【单选题】
下列有关药物安全性的叙述，正确的是
①
LD50 / ED50 的比值越大，用药越安全
②
LD50 越大，用药越安全
③
药物的极量很小，用药越安全
④
LD50 / ED50 的比值越小，用药越安全
⑤
以上都不是
【单选题】
数据库系统中，物理数据独立性是指（ ）。
①
A.数据库与数据库管理系统的相互独立
②
B.应用程序与DBMS的相互独立
③
C.应用程序与存储在磁盘上数据库的物理模式是相互独立的
④
D.应用程序与数据库中数据的逻辑结构相互独立
随机题目
【单选题】
The fact ________ that we are behind the other classes.
①
seems to be
②
must be
③
remains
④
take
【单选题】
By _________ learning possible anytime and anywhere, distance education is a powerful tool for supporting lifelong learning.
①
making
②
make
③
made
④
be made
【单选题】
One big of formal education is the high cost.
①
advantage
②
disadvantage
③
problem
④
condition
【单选题】
No more having to buy expensive textbooks which you will only use for a year or two and then sell or _______ away.
①
get
②
give
③
take
④
gain
【单选题】
Lifelong learning is both formal and non-formal; and the boundaries between face-to-face teaching and ___________ education are increasingly blurred.
①
lifelong
②
formal
③
distance
④
far
【单选题】
I hope you are making ________ for continuous education in your life.
①
room
②
vacancy
③
place
④
like
【单选题】
Some universities offer free, non-credit MOOCs __________ to anyone in the world.
①
useful
②
available
③
easy
④
careful
【单选题】
Well, that’s to say, every coin has two sides, ________ technology.
①
so is
②
so does
③
so has
④
so did
【单选题】
_________ the regular classes, you can also attend many different seminars and take part in many extracurricular activities.
①
Except for
②
Including
③
Apart from
④
Included
【单选题】
—How long have you been graduated from your college?— .
①
Yes, I’ve been graduated
②
I’ve been graduated for five years
③
I graduated from my college last year
④
I graduat from my college last year