正确答案: B

fiber optic cable

题目：In a data communication system, which transport media can be described as following: Has two classes: single mode and multiple mode; with higher transmit rate; with the best reliability

解析：B

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举一反三的答案和解析：

[单选题]（7）、若服务器系统可用性达到99.99%，那么每年的停机时间必须小于

53分钟

[单选题]研制成功第一台电子数字计算机的国家是____。

美国