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【单选题】
从拉压杆轴向伸长（缩短）量的计算公式Δl=Nl/EA可以看出，E和A值越大，Δl越小，故（ ）。
A.
E 为杆的抗拉（压）刚度
B.
乘积 EA 表示材料抵抗拉伸（压缩）变形的能力
C.
乘积 EA 为杆的抗拉（压）刚度
D.
以上说法都不正确
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