网络故障分类有()
A.业务故障
B.设备故障
C.网络故障
D.通信故障
参考答案:A, B
--- Mary knows so much about ______earth!
---Yes, although she is only ____eight- year-old girl.
A.an; a
B.the; an
C.the; a
D.an; an
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