为了确定网络层所经过的路由器数目，应使用什么命令______ A．p_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

为了确定网络层所经过的路由器数目，应使用什么命令______

A．ping
B．arp-a
C．stack-test
D．traceroute
E．telnet

答案

参考答案：D

单项选择题共用题干题

男性，35岁，劳力性呼吸困难，心悸，气短，少尿，下肢浮肿1年余，1周前咽痛、咳嗽、咯黄痰后呼吸困难加重，夜间不能平卧。超声心动图示，左右心室扩张，弥漫性运动不良，左心室射血分数30％。既往无任何特殊病史。

该患者的心功能为（）

A.Ⅰ级

B.Ⅱ级

C.Ⅲ级

D.Ⅳ级

E.无症状性心功能不全

补全对话，情景问答

从方框中的句子中找出最恰当的句子填入对话中，使对话完整、通顺。

A. How are you going to do that?
B. Where are you going to take singing lessons?
C. I want to be a singer.
D. I like Jay Chou very much.
E. I'm going to start next week.
F. Are you going to sing country music?
G. I began learning singing when I was 6.

A: What are you going to be when you leave school?
B: __________________________
A: __________________________
B: No. I'm not. I'm going to sing Jazz music.
A: __________________________
B: I'm going to take singing lessons.
A: When are you going to start?
B:
A:
B: In New York.