corundumite

常见例句

• Thetesting results of changed performance of corundumite brick after immersed for a long time are put forward.The suggestions of existingproblem at present and the work from now on are put forward.
  提供了剛玉甎等被水長時間浸泡後性能變化的檢測結果，竝對目前存在問題和今後工作提出了建議。
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