下列属于"治未病"实践道德原则的是（） A.以提高人民群众健康水平为目的 B.尊重和

Friendship is very importance. Everyone needs friendship. In all our lives we can’t live without friendship just as we can’t live without air and water. Friendship makes us getting on well with one another to go ahead under different kind of difficulties in the front of us. But real friendship is no easy to come by. True friendship must be sincerely and be based on understand each other but not on benefits of each other. A good friend can always be a good teacher to us. By his advices we are persuading to go the right way. Therefore more friends we have, the better we can improve ourselves.

在下列存储器中，访问速度最快的是( )。

A．硬盘存储器
B．软盘存储器
C．磁带存储器
D．半导体RAM(内存储器)

我国的CN域名由（）负责管理。

A.CNNIC

B.CNNET

C.ICANN

D.ICNET

透明盖板是平板型集热器中（），并由透明（）材料组成的板状部件。

电空制动控制器过充位，制动管无过充压力的原因有哪些？