单项选择题
主机131.50.39.23/21属于下列哪个子网？（）
A.131.50.39.0/21
B.131.50.32.0/21
C.131.50.16.0/21
D.131.50.8.0/21
点击查看答案
单项选择题
A.131.50.39.0/21
B.131.50.32.0/21
C.131.50.16.0/21
D.131.50.8.0/21
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