【单选题】
A <{p data-we-empty-p="" _msthash="20518" _msttexthash="11267776"}>营业利润<{/p}>
B <{p data-we-empty-p="" _msthash="20519" _msttexthash="17834739"}>安全边际率<{/p}>
C <{p data-we-empty-p="" _msthash="20520" _msttexthash="4050527"}>不变<{/p}>
D <{p data-we-empty-p="" _msthash="20521" _msttexthash="4241653"}><{font _mstmutation="1" _msthash="27709643" _msttexthash="8974602"}>保本量<{/font}><{br/}><{/p}>
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