【单选题】
A <{p}><{font _mstmutation="1" _msthash="20512" _msttexthash="23124621"}>单位边际贡献<{/font}><{br/}><{/p}>
B <{p}><{font _mstmutation="1" _msthash="20513" _msttexthash="19638437"}>边际贡献率<{/font}><{br/}><{/p}>
C <{p}><{font _mstmutation="1" _msthash="20514" _msttexthash="17024839"}>单位变动成本<{/font}><{br/}><{/p}>
D <{p}><{font _mstmutation="1" _msthash="20517" _msttexthash="38909546"}>加权平均边际贡献率<{/font}><{br/}><{/p}>
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