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刷刷题刷刷变学霸
举一反三
【单选题】Music to My Ears When other shad doubts, my father believed in me. As a boy growing up in Shenyang, China, I practiced the piano six hours a day. I loved the instrument. My mother, Xiulan Zhou, taught...
A.
The whole family moved to Beijing.
B.
He and his father went to Beijing to learn piano.
C.
His mother got iii.
D.
His family objected to his learning in Beijing.
【单选题】在数量上，( )等于不同方案之间增加或缩小单位物业管理服务量的成本变化量，乘以增加或减少的单位服务量，再加上由于增加或缩小服务规模而导致的“固定成本”。
A.
边际成本
B.
差异成本
C.
机会成本
D.
估计成本