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The development of fracture mechanics marked a crucial advance in our understanding of crack growth in glasses and ceramics; before the advent of this discipline, many of the details of the crack growth process were _____________ those who studied ceramics.
- A.invaluable to
- B.interesting to
- C.opaque to
- D.useless to
- E.demonstrated by
C显示答案
以上解析由 考满分老师提供。
