物理层10BASE-5协议规定，粗同轴电缆的一个缆段最大长度为( )。 A．50m
题型：单项选择题
问题：
物理层10BASE-5协议规定，粗同轴电缆的一个缆段最大长度为( )。
A．50m
B．100m
C．500m
D．1000m
题型：单项选择题
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| Manv families have their fun birthdavs. Here are some. The Smith Family-I'm Vera Smith. Every year on my birthday, I wear mom's skirt. Father takes pictures of me. The skirt is very big on my first birthday. But it's OK on my fifteenth birthday.  The chirk Family -I'm William. I have " Gifts All Month". My birthday is in May ,so I get giftfrom May 1st to May 3lst. I have a sister Lisa. Her birthday is in September.  The Green Family-I'm Lily. I have a birthday tablecloth(桌布) . On my birthday, my mother brings my socks and I draw the picture of my socks on the tablecloth. I have ten pictures now.  | ||||||||
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