單項選擇題高純鈦是指()

A.鈦的質(zhì)量分數(shù)不小于99.99%
B.鈦的質(zhì)量分數(shù)不小于99.9%
C.鈦的質(zhì)量分數(shù)不小于99.8%
D.鈦的質(zhì)量分數(shù)不小于99%


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