目前我国通信机房主要分为那两种机房?()
A.接入网机房和网管机房
B.传输机房和交换机房
C.有人值守机房和无人值守机房
D.计算机机房和数据机房
参考答案:C
I tried in vain to persuade him to give up that idea.
系统性红斑狼疮面部典型皮损的特点是
A.盘状红斑
B.环形红斑
C.蝶形红斑
D.网状红斑
E.丘疹状红斑