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【单选题】
What is the difference between front and back office systems?A.
Front office systems are external systems; back office systems are internal.
B.
Front office systems are Web based; back office systems are built on database systems.
C.
Front office systems process information in the beginning of a customer's transaction; back office systems process information at the end of the customer's transaction.
D.
Front office systems focus on getting the sale; back office systems focus on follow-up.
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【简答题】确定走刀路线的原则?
【单选题】如图所示电路中,若增大 ,则_________。
A.
I 1 和 I 2 均变小
B.
I 1 和 I 2 均变大
C.
I 1 和 I 2 均不变
D.
I 1 不变 I 2 变大
【简答题】数控车削锥面的两种加工路线（）走刀路线、（）走刀路线。
【简答题】4个月的佝偻病患儿可有:
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