炉水全挥发处理

家政服务员应具备合法身份，年满16周岁，且在（）周岁以下。

橘皮精油的提取过程中，过滤得到水、果蜡和橘皮油的混合物，静止5d～7d后，用吸管吸出的物质是[ ]

A．上层中的水

B．下层中的果蜡

C．下层中的水和果蜡

D．上层中的橘皮油

假设就绪队列中有10个进程，系统将时间片设为400ms，CPU进行进程切换要花费20ms。则系统开销所占的比率约为______。

A．1%

B．5%

C．10%

D．20%

（）是为了解决与系统联系薄弱地区的正常受电问题，该装置动作切除部分负荷，以保证区域发供电的平衡。

(1) In the strength of the carrier signal is varied to represent binary 1 or 0.

(2) is a system that can map a name to an address and conversely an address to an name.

(3) is a three-way handshaking authentication protocol that it’s packets are encapsulated in the point-to-point protocol

(4) is an approach that enables an ATM Switch to behave like a LAN switch.

(5) is an guided media which is made of glass or plastic and transmits signals in the form of light.

3（）

A．PPP

B．PAP

C．CHAP

D．LCP