【单选题】
A <{p}><{font _mstmutation="1" _msttexthash="10864672" _msthash="475"}>σ1 = 2σ， ΔL1 = 2ΔL<{/font}><{br/}><{/p}>
B <{p}><{font _mstmutation="1" _msttexthash="12632386" _msthash="351"}>σ1 = 0.5σ， ΔL1 = ΔL<{/font}><{br/}><{/p}>
C <{p}><{font _mstmutation="1" _msttexthash="11773398" _msthash="462"}>.σ1 = 4σ， ΔL1 = 4ΔL<{/font}><{br/}><{/p}>
D <{p data-we-empty-p="" _msttexthash="10864932" _msthash="307"}>σ1 = 4σ， ΔL1 = 2ΔL<{/p}>
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