【单选题】
A <{p data-we-empty-p="" _msttexthash="4823" _msthash="544"}><{font _mstmutation="1" _msttexthash="36632050" _msthash="588"}>剪力图、弯矩图都改变<{/font}><{br/}><{/p}>
B <{p}><{font _mstmutation="1" _msttexthash="41845791" _msthash="351"}>剪力图不变,只弯矩图改变;<{/font}><{br/}><{/p}>
C <{p}><{font _mstmutation="1" _msttexthash="40664689" _msthash="523"}>弯矩图不变,只剪力图改变<{/font}><{br/}><{/p}>
D <{p data-we-empty-p="" _msttexthash="35475310" _msthash="307"}>剪力图、弯矩图都不变<{/p}>
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