【单选题】
A <{p}><{font _mstmutation="1" _msttexthash="35835657" _msthash="71"}>仅对刚体系统才适用<{/font}><{br/}><{/p}>
B <{p}><{font _mstmutation="1" _msttexthash="63996309" _msthash="72"}>B.仅对作用于刚体上的力才适用<{/font}><{br/}><{/p}>
C <{p}><{font _mstmutation="1" _msttexthash="88694346" _msthash="84"}>对作用于同一刚体或变形体上的力均适用<{/font}><{br/}><{/p}>
D <{p}><{font _mstmutation="1" _msttexthash="33748715" _msthash="131"}>C.仅对变形体才适用<{/font}><{br/}><{/p}>
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