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【多选题】
Which tow statements are most correct regarding opt-in models?（）A.
A based opt-in model uses virtualized identifiers
B.
A based opt-in model uses hardware values as identifiers
C.
A logical server opt-in model uses virtualized identifiers
D.
A logical server opt-in model uses hardware values as identifiers
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举一反三
【单选题】______ various internal and external sources of finance that a business can employ when seeking to fund its operations.
A.
It exists
B.
There exist
C.
There is
D.
It does
【简答题】简述在输液过程中,出现液体不滴可能的原因,判断及处理方法。
【简答题】简述在输过程中,出现液体不滴可能的原因,判断及处理方法
【单选题】Internal scale economies occur when:
A.
Firm growth leads to more specialization by workers.
B.
Industry growth gives rise to better input markets.
C.
Industry growth leads to a greater diffusion of knowledge among firms.
D.
Firm growth drives up prices of some of the firm’s inputs.
【单选题】B类网络的缺省子网掩码为( ). (3分)
A.
255.255.255.255
B.
255.255.255.0
C.
255.255.0.0
D.
255.0.0.0
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