【单选题】
A <{p data-we-empty-p="" _msthash="20502" _msttexthash="17024839"}>单位变动成本<{/p}>
B <{p data-we-empty-p="" _msthash="20503" _msttexthash="10524592"}>变动成本<{/p}>
C <{p}><{font _mstmutation="1" _msthash="20497" _msttexthash="10835734"}>固定成本<{/font}><{br/}><{/p}>
D <{p}><{font _mstmutation="1" _msthash="20501" _msttexthash="39727766"}>变动成本和固定成本之和<{/font}><{br/}><{/p}>
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