The results show that with the increase of the cone angles and the coefficientsoffriction in the certain range, the stress of the anchor ring can gradually decrease.
结果表明：随着锥角和摩擦系数在一定范围内增大，锚环的应力会逐渐减小；
2
A little bit of water on the plank would locally make the frictioncoefficients larger.
木板哪怕沾了一点水，局部的摩擦系数就会改变。
3
A vehicle used to measure the frictioncoefficientsof airstrip is researched and developed.