【单选题】
A <{p}><{font _mstmutation="1" _msthash="20524" _msttexthash="10166520"}>产销量<{/font}><{br/}><{/p}>
B <{p}><{font _mstmutation="1" _msthash="20525" _msttexthash="10862839"}>销售单价<{/font}><{br/}><{/p}>
C <{p}><{font _mstmutation="1" _msthash="20526" _msttexthash="17024839"}>单位变动成本<{/font}><{br/}><{/p}>
D <{p}><{font _mstmutation="1" _msthash="20527" _msttexthash="10835734"}>固定成本<{/font}><{br/}><{/p}>
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