[单选] Why are the 1300 nm and 1550 nm regions of the fiber spectrum primarily used for optical communications？（）

A . They are both regions of lowest loss.
B . They are both regions of low reflections.
C . They are both regions of low index of refraction.
D . They are both regions of low chromatic dispersion.
E . They are both regions of low Polarization Mode Dispersion （PMD）.

碳酸锂重度中毒时的治疗措施，不正确的是（）减少碳酸锂剂量。停用碳酸锂。补液。利尿。人工透析。鞭毛藻类什么是软件？什么是软件工程？ What is the maximum number of CTI ports for a Cisco Unified Contact Center Express 4.0 Standard deployment? （） 150 。 200 。 300 。 varies based on the number of expansion servers used 。 varies based on the number of applications configured&e。不属于充电电流小的原因是（）发动机传动带打滑。发电机个别二级管损坏。发电机电刷滑环接触不良。电压调解器低速触点烧结。 Why are the 1300 nm and 1550 nm regions of the fiber spectrum primarily used for optical communications？（）

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[单选] Why are the 1300 nm and 1550 nm regions of the fiber spectrum primarily used for optical communications？（）

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