[单选]
The dispersion of a non-zero dispersion shifted fiber is 6 ps/nmkm at 1550 nm and 10 ps/nmkm at 1610 nm.
What is the minimum dispersion compensation required if an L-Band DWDM signal travels through 200 km of fiber and has a dispersion tolerance of 1800 ps/nm？（）

A . none
B . -600 ps/nm
C . -200 ps/nm
D . +200 ps/nm
E . +600 ps/nm

如果说朦胧诗是时代“风云”记录，那么第三代诗就属个人“（）”白描。《（）》的出版，标志着中国现代诗歌发展的第一个时期“初期白话诗歌”时期的结束。如图所示，用吊索起吊重为W的构件，两斜索与构件所成的角度为a，吊点对称，则斜索内力最大时的角度a为（）。 30°。 45°。 60°。 75°。喇叭的调整包括（）和（）两项。 SONET Path Terminating Equipment (PTE) requires which three line codes to be supported for DS1 and DS3 circuits?（） (Choose three.) AMI。 ESF。 DUS。 SSM。 B3ZS。 B8ZS。

The dispersion of a non-zero dispersion shifted fiber is 6 ps/nm*km at 1550 nm and 10 ps/nm*km at 1610 nm.
What is the minimum dispersion compensation required if an L-Band DWDM signal travels through 200 km of fiber and has a dispersion tolerance of 1800 ps/nm？（）

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[单选] The dispersion of a non-zero dispersion shifted fiber is 6 ps/nm*km at 1550 nm and 10 ps/nm*km at 1610 nm. What is the minimum dispersion compensation required if an L-Band DWDM signal travels through 200 km of fiber and has a dispersion tolerance of 1800 ps/nm？（）

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[单选]
The dispersion of a non-zero dispersion shifted fiber is 6 ps/nmkm at 1550 nm and 10 ps/nmkm at 1610 nm.
What is the minimum dispersion compensation required if an L-Band DWDM signal travels through 200 km of fiber and has a dispersion tolerance of 1800 ps/nm？（）