【单选题】
A <{p data-we-empty-p="" _msthash="20518" _msttexthash="8974602"}>保本量<{/p}>
B <{p data-we-empty-p="" _msthash="20519" _msttexthash="8974602"}>保本量<{/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="13812760"}>保本作业率<{/font}><{br/}><{/p}>
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