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【单选题】
Q9.Which of the following can be inferred about supplier partnerships, as they are described in the passage?A.
They cannot be sustained unless the goods or services provided are available from a large number of suppliers.
B.
They can result in purchasers paying more for goods and services than they would in a competitive-bidding situation.
C.
They typically are instituted at the urging of the supplier rather than the purchaser.
D.
They are not feasible when the goods or services provided are directly related to the purchasers’ end products.
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【简答题】3 比例运算电路 可实现 A u > 1 的放大器,而 比例运算电路可实现 A u < 0 的放大器(选填同相、反相、单相、双相)。
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