The results show that with the increase of the cone angles and the coefficients of friction 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；
A little bit of water on the plank would locally make the friction coefficients larger.
木板哪怕沾了一点水，局部的摩擦系数就会改变。
A vehicle used to measure the friction coefficients of airstrip is researched and developed.
研究开发了用于测量飞机跑道摩擦系数的测试车。
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