题目内容

在理解误码率时，应该注意以下问题，其中叙述中正确的是______。 I.应衡量数据传输系统正常工作状态下传输可靠性的参数 II.对于实际的数据传输系统，可以笼统地说误码率越低越好 III.对于实际数据传输系统，如果传输的不是二进制码元，要折合成二进制码元来计算

A. I、II 和 III
B. 仅 I 和 II
C. 仅 I 和 III
D. 仅 II 和 III

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