【单选题】
A <{p}><{font _mstmutation="1" _msttexthash="44412849" _msthash="475"}>比例极限降低,塑性提高;<{/font}><{br/}><{/p}>
B <{p}><{font _mstmutation="1" _msttexthash="47680763" _msthash="351"}>.比例极限提高,塑性降低<{/font}><{br/}><{/p}>
C <{p}><{font _mstmutation="1" _msttexthash="44521451" _msthash="523"}>强度极限降低,塑性提高;<{/font}><{br/}><{/p}>
D <{p data-we-empty-p="" _msttexthash="44090800" _msthash="307"}>强度极限提高,塑性降低<{/p}>
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