元组的每个分量必须是不可分的数据项这叫做______。

题型:填空题

问题:

元组的每个分量必须是不可分的数据项这叫做______。

考点:计算机等级考试数据库技术三级数据库技术笔试
题型:填空题

阅读理解.

     Many students in the USA always take the school bus to school every day. Parents think taking the

school bus is very safe(安全的). But sometimes it is also dangerous. Some students died(死亡) because

they broke the school bus rules. Here are some school bus rules:

     ◆Amve at the bus station early. 

     ◆Wait for the bus at the bus station. 

     ◆Don't play around the bus. 

     ◆Don't run everywhere at the bus station. 

     ◆Don't walk or fight in the bus when it is going. 

     ◆Don't try to leave the bus until it stops. 

     These rules are good for students. Remember them and don't break them. So you can keep yourself

safe.

根据短文内容,判断下列句子正( T)误( F) 。

( )1. Taking the school bus to school is always safe.

( )2. Students can run everywhere at the bus station.

( )3. Students have to sit on their seats when the bus is going.

( )4. Students can't get to the bus station late.

( )5. It can be dangerous if students break the school bus rules.

题型:填空题

在OSI参考模型中,属于传输层的协议是()。

A.TELNET

B.SNMP

C.TCP

D.ICMP

题型:填空题

医师处方写续随子时,应付()

A.马钱子

B.青葙子

C.地肤子

D.木鳖子

E.千金子

题型:填空题
如图所示为一磁流体发电机示意图,A、B是平行正对的金属板,等离子体(电离的气体,由自由电子和阳离子构成,整体呈电中性)从左侧进入,在t时间内有n个自由电子落在B板上,则关于R中的电流大小及方向判断正确的是(  )

A.I= ,从上向下

B.I= ,从上向下

C.I= ,从下向上

D.I= ,从下向上

题型:填空题

拔伸牵引的作用不包括()。

A.矫正缩短移位

B.调动肌肉夹板作用矫正移位

C.促进血液循环

D.为施行其他手法创造条件

E.暂时固定骨折

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