硬度是指金属材料抵抗更硬物体压入的能力。
参考答案：错
---We think it is wrong ______ him ______her copy the homework.
A．of; to help
B．for; to help
C．of; helping
D．for; helping
论述锚桩引出钢丝绳与地面的夹角增大时，锚的承载能力将发生什么变脂？
