The tensile strength, bending strength, impact strength, tensile modulus of elasticity and bending modulus of elasticity were determined.
测试了塑木板材的拉伸强度、弯曲强度、冲击强度、拉伸弹性模量、弯曲弹性模量等力学性能；
Based on the difference ratio of the rock's equivalent modulus of elasticity, the differential ratio method of equivalent modulus of elasticity is established.
等效弹性模量差比法是根据岩石的等效弹性模量差比值建立的。
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