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[ÇóÖú] the conflict between crack resistance and elastic modulus(for polymer)

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1.¶ÔÓڸ߷Ö×Ó¶øÑÔ£¬ÈçºÎÀí½âcrack resistance?
2. ¸ß·Ö×Ó²ÄÁÏÖеÄcrack resistanceºÍelastic modulusÖ®¼äÓÐʲô³åÍ»£¿

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