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		基于声发射矩张量分析混凝土破坏的裂纹运动 1)
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			INVESTIGATION ON CRACK GROWTH IN CONCRETE BY MOMENT TENSOR ANALYSIS OF ACOUSTIC EMISSION 1)
			 
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		 图8. 剪切分量$X$的值与裂纹运动方向和法线夹角之间的关系  | 
	
Fig.8. Angle between crack slip and crack normal vectors versus the shear ratio  | 
	
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