【单选题】I am sure () he said is true.
【单选题】I am not sure he is at home or not.
【单选题】一平面应力状态如图所示,如果最大主应力为拉应力100MPa,试求:(1)上述面上的切应力t;(2)该点处另一非零主应力;【图片】
【简答题】若一点应力的三个主值存在 a 1 > a 2 > a 3 , 则最大切应力所在平面上的正应力为 。
【单选题】I am sure he is fully ______ of the danger.
【单选题】The boy is curious _____ everything. I am sure he is very clever.