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问题 填空题

两个同心圆的半径差为5，其中一个圆的周长为15π，则另一个圆的周长为______．

答案

根据题意，两圆周长差=2×5π=10π，

①另一个圆的周长为15π-10π=5π，

②另一个圆的周长为15π+10π=25π，

∴另一个圆的周长为5π或25π．

选择题

用10N的水平推力推着重为60N的物体沿水平方向做直线运动，若推力对物体做了60J的功，则在推力做功的过程中（　　）

A．物体一定运动了1m

B．物体一定运动了6m

C．物体一定受了10N的摩擦力

D．物体一定受了60N的摩擦力
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单项选择题

SOCKS is a genetic proxy protocol for TCP/IP-based networking, applications. SOCKS includes two (21) , the SOCKS server and the SOCKS client. The SOCKS server is implemented at the application layer. The SOCKS client is implemented between applications and the (22) layer. When an application client needs to connect to an application server, the client connects to a SOCKS proxy server. The proxy server connects to the application server instead of the client, and (23) data between the client and the application server. For the application server, the proxy server is the (24) . SOCKS is also one of the popular (25) to network firewalls. Because of its simplicity and flexibility, SOCKS has been used as genetic application proxy in virtual private network (VPN), and for extranet applications.

A．workstation

B．user

C．customer

D．client
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