【多选题】
A <{p}><{font _mstmutation="1" _msthash="20522" _msttexthash="15523677"}>保利点下降<{/font}><{br/}><{/p}>
B <{p}><{font _mstmutation="1" _msthash="20523" _msttexthash="13629369"}>保本点上升<{/font}><{br/}><{/p}>
C <{p}><{font _mstmutation="1" _msthash="20524" _msttexthash="30808219"}>单位边际贡献增加<{/font}><{br/}><{/p}>
D <{p}><{font _mstmutation="1" _msthash="20527" _msttexthash="30323709"}>边际贡献率提高<{/font}><{br/}><{/p}>
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