【单选题】
A <{p}><{font _mstmutation="1" _msttexthash="121581876" _msthash="364"}>轴向有最大正应力,轴线夹角 45°方向有最大切应力;<{/font}><{br/}><{/p}>
B <{p}><{font _mstmutation="1" _msttexthash="122908435" _msthash="351"}>轴向有最大切应力,轴线夹角 45°方向有最大正应力<{/font}><{br/}><{/p}>
C <{p}><{font _mstmutation="1" _msttexthash="92774578" _msthash="288"}>只有横截面法向方向的正应力,没有切应力;;<{/font}><{br/}><{/p}>
D <{p data-we-empty-p="" _msttexthash="54211157" _msthash="307"}>横截面既有正应力又有切应力<{/p}>
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