题目内容：
下面说法正确的是（）
A.为了使光波在纤芯中传输，包层的折射率必须等于纤芯的折射率
B.为了使光波在纤芯中传输，包层的折射率必须小于纤芯的折射率
C.为了使光波在纤芯中传输，包层的折射率必须大于纤芯的折射率
D.为了使光波在纤芯中传输，包层的折射率必须大于涂覆层的折射率
参考答案：
选择题：下面说法正确的是：（）
- 题目分类：中国大学MOOC慕课
- 题目类型：选择题
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