问题
单项选择题
IP电话系统有4个基本组件，它们分别是终端设备、网关、多点控制单元和______。
A．路由器
B．交换机
C．网守
D．集线器
答案
参考答案：C
解析：[知识点] IP电话系统的组成 [评析] IP电话系统有4个基本组件：终端设备、网关、多点控制单元和网守。
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IP电话系统有4个基本组件，它们分别是终端设备、网关、多点控制单元和______。
A．路由器
B．交换机
C．网守
D．集线器
参考答案：C
解析：[知识点] IP电话系统的组成 [评析] IP电话系统有4个基本组件：终端设备、网关、多点控制单元和网守。
| 从下面方框中选择适当的选项填人短文中，使短文通顺、完整.选项中有两个选项是多余选项。 | |
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| Tommy hated school and was always looking for excuses not to go. If he sneezed, he askcd his mother to 1 a note saying he had a cold. If he had a headache, he asked his mothcr to take him to the doctor during _2 hours. He spent 3 timc at home than he did at school. He often looked for excuses to come home 4 . One day, he came home 5 school in the middle of the morning. His father was 6 . "You're home early he said. "Is school closed today?" "No, Dad," Tommy said. "It's 7 . I came home early. " "How did you do that ?" his father askel him. 6'What did you __8 _ to the teacher ?" "I told her that I had a new baby _ 9 and that 1 had to come home and help you. " " 10 your mother has had twins," his father said, "a boy and a girl. You're got a baby brother and a baby sister." "Yes, I know, Dad," Tommy said. "I'm saving up my baby sister for next week" |