下列等式中表达正确的有
A.变动成本率+安全边际率=1
B.变动成本率+保本作业率=1
C.边际贡献率+安全边际率=1
D.边际贡献率+变动成本率=1
E.安全边际率+保本作业率=1
正确答案是DE
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Bricks are strong, hard, and resistant to fire and ( )from the weather, so they have been used as a building material for
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