螺栓联接的强度计算一般情况可进行（）计算，必要时还要进行剪切强度和挤压强度的计算。
参考答案：拉伸强度
30．One of the greatest of unhappiness，in my experience，is the difficulty we have in
accepting things as they are．
A．reasons
B．styles
C．supplies
D．Sources
化学吸附
