题目内容

经过特赦的犯罪分子，其犯罪与刑事责任均在法律上归于消灭。

A. 对
B. 错

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Single-modefiberscanbedividedinto().单模光纤可以分为（）。

A. NDSF非色散位移单模光纤
B. DSF色散位移单模光纤
C. Plasticcoreopticalfiber塑芯光纤
D. NZDSF非零色散位移单模光纤

The non-zero dispersion shifted single-mode fiber, also known as () fiber, is a new type of fiber designed and manufactured to adapt to the WDM transmission system.

A. G.652
B. G.653
C. G.654
D. G.655

阶跃光纤中的传输模式是靠光射线在纤芯和包层的界面上（）而使能量集中在芯子之中传输。

A. Half reflection
B. total reflection
C. Total refraction
D. transmission

At present, most of the optical fibers used in long-distance trunk transmission communication systems are single-mode fibers.目前长距离干线传输通信系统使用的光纤多为单模光纤。

A. 对
B. 错