The SIF decreases with the friction coefficient rising when the surface crack tip lies in the base and the reflective crack length is more than a certain value.
反射裂缝裂尖位于面层中且裂缝长度大于某一值时，应力强度因子随着摩擦系数的增加而减小。
We find that the soil which moisture is more than a certain value is represented as Non Lambert reflector, but when less than the value, the soil is represented as Lambert reflector.
多角度遥感中我们发现具有一定湿度的土壤表现为非朗伯体。而小于这个湿度时土壤则表现为朗伯体。
If, as a living doormat, valve damage, or due to other reasons, led to pressure to increase exports and to permit more than a certain value, the safety valve will automatically open the exhaust.
如果由于活门垫、活门损坏或由于其它原因，导致出口压力自行上升并超过一定许可值时，安全阀会自动打开排气。
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