问题
单项选择题
具有Ⅱ型观测线的基牙
A．近缺隙侧倒凹区小，远缺隙侧倒凹区大
B．近缺隙侧倒凹区小，远缺隙倒凹区也小
C．近缺隙侧倒凹区大，远缺隙侧倒凹区小
D．近缺隙侧倒凹区大，远缺隙侧倒凹也大
E．近缺隙侧和远缺隙均有明显的倒凹
答案
参考答案：C
解析：Ⅱ型观测线为基牙向缺隙方向倾斜时所画出的导线，基牙上主要的倒凹区靠近缺隙侧。
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具有Ⅱ型观测线的基牙
A．近缺隙侧倒凹区小，远缺隙侧倒凹区大
B．近缺隙侧倒凹区小，远缺隙倒凹区也小
C．近缺隙侧倒凹区大，远缺隙侧倒凹区小
D．近缺隙侧倒凹区大，远缺隙侧倒凹也大
E．近缺隙侧和远缺隙均有明显的倒凹
参考答案：C
解析：Ⅱ型观测线为基牙向缺隙方向倾斜时所画出的导线，基牙上主要的倒凹区靠近缺隙侧。
| 76． (1) is a channel’s capacity which directly reflects the data transfer rate of the channe1. (2) functions in a NetWare network which is used to define addressing schemes. (3) is a network layer device that supports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains. (4) is the popular LAN developed under the direction of the IEEE802.3. (5) is a device which enables digital microcomputers to communicate across analog telephone lines. |
(3)
A．The repeater
B．The hub
C．The bridge
D．The router