题目内容

光纤通信所使用的波段位于电磁波谱中的:()

A. 近红外区
B. 可见光区
C. 远红外区
D. 近紫外区

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What is an appropriate use of a default route?()

A. to provide routing to a local web server
B. to provide routing from an ISP to a stub network
C. to provide routing that will override the configured dynamic routing protocol
D. to provide routing to a destination that is not specified in the routing table and which is outside the local network

局限性硬皮病分为()()(),系统性硬皮病可分为()()。

抽样平均误差是表明抽样估计的准确度,抽样()则是表明抽样估计准确程度的范围;两者既有区别,又有联系。

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