The crack tends to grow into the more brittle material and then stay in there, whether the initial crack tip lies in the graded

The crack tends to grow into the more brittle material and then stay in there, whether the initial crack tip lies in the graded material or in the more ductile material(and thereafter advances across the graded layer.

A.tends

B.whether

C.thereafter

D.lies in

正确答案:tends

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