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【单选题】
Opportunity cost is:A.
about half of the monetary cost of a product.
B.
the dollar payment for a product.
C.
the benefit derived from a product.
D.
the value of the best alternative forgone in making any choice.
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【单选题】根据《标准施工合同》，关于监理人对质量检验和试验的说法，正确的是（）。
A.
监理人收到承包人共同检验的通知，未按时多参加校检检验，承包人单独检验，该检验无效
B.
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C.
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D.
重新检验结果证明质量符合合同要求的，因此增加的费用由发包人和监理人共同承担
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