單項選擇題某設(shè)備自重為35t/臺,已知該類設(shè)備的安裝費率為:30t/臺為5.2%.40t/臺為3.8%,用插入法計算該項設(shè)備的安裝費率為()

A.4.5%
B.5.9%
C.3.1%
D.3.8%


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