Uru 1. Ìhè: Njupụta nke oghere resin n'ozuzu bụ 0.83-1.5, ebe iko anya bụ 2.27 ~ 5.95.2. ike mmetụta na-eguzogide: Mmetụta mmetụta nke resin lens bụ n'ozuzu 8 ~ 10kg / cm2, bụ ọtụtụ ugboro iko, n'ihi ya, ọ dịghị mfe imebi, mma na inogide.3. Ezi ọkụ na-ebufe ...
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