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【单选题】
一端固定、另一端有弹簧侧向支承的细长压杆,可采用公式Pcr=π2EI/(μl)计算。压杆的长度系数 的正确取值范围是( )。A.
>2.0;
B.
0.7< <2.0;
C.
<0.5;< /div>
D.
0.5< <0.7
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