【单选题】
A <{p}><{font _mstmutation="1" _msthash="20537" _msttexthash="30909216"}>气体的内能保持不变<{/font}><{br/}><{/p}>
B <{p}><{font _mstmutation="1" _msthash="20538" _msttexthash="29278574"}>气体的压力保持不变<{/font}><{br/}><{/p}>
C <{p}><{font _mstmutation="1" _msthash="20539" _msttexthash="19950359"}>气体对外不作功<{/font}><{br/}><{/p}>
D <{p}><{font _mstmutation="1" _msthash="20540" _msttexthash="39191685"}>气体与外界无热量交换<{/font}><{br/}><{/p}>
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