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Why are the 1300 nm and 1550 nm regions of the fiber spectrum primarily used for optical communications？（） They are both regions of lowest loss.。 They are both regions of low reflections.。 They are both regions of low index of refraction.。 They are both regions of low chromatic dispersion.。 They are both regions of low Polarization Mode Dispersion （PMD）.。
简述脊柱牵引的生理效应及其影响因素。
Quarter是个枚举类型，包含4个值。其定义如下： Enum Quarter Spring Summer Autumn Winter End Enum 请问以下代码执行后变量q_int的值是（）。 0。 1。 2。 3。 4。
What is the maximum number of CTI ports for a Cisco Unified Contact Center Express 4.0 Standard deployment? （）
