问题
单项选择题
光缆缆芯是由光纤芯线组成，它可分为单芯和（）两种。
A.2芯
B.3芯
C.4芯
D.多芯
答案
参考答案：D
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光缆缆芯是由光纤芯线组成，它可分为单芯和（）两种。
A.2芯
B.3芯
C.4芯
D.多芯
参考答案：D
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