【单选题】
A <{p}><{font _mstmutation="1" _msthash="20512" _msttexthash="77402"}>MSR - dR=1<{/font}><{br/}><{/p}>
B <{p}><{font _mstmutation="1" _msthash="20513" _msttexthash="99502"}>MSR×dR=1<{/font}><{br/}><{/p}>
C <{p}><{font _mstmutation="1" _msthash="20514" _msttexthash="77142"}>MSR+dR=1<{/font}><{br/}><{/p}>
D <{p}><{font _mstmutation="1" _msthash="20515" _msttexthash="77662"}>MSR/dR=1<{/font}><{br/}><{/p}>
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