【单选题】
A <{p}><{font _mstmutation="1" _msthash="20512" _msttexthash="69980742"}>边际贡献率与安全边际率之乘积<{/font}><{br/}><{/p}>
B <{p}><{font _mstmutation="1" _msthash="20513" _msttexthash="62850372"}>边际贡献率与安全边际率之差<{/font}><{br/}><{/p}>
C <{p}><{font _mstmutation="1" _msthash="20514" _msttexthash="62303020"}>边际贡献率与安全边际率之商<{/font}><{br/}><{/p}>
D <{p}><{font _mstmutation="1" _msthash="20517" _msttexthash="62257078"}>边际贡献率与安全边际率之和<{/font}><{br/}><{/p}>
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