The optimum ratio betweoparticle ─ size, particle weight, and flou . rate of mobile phase were studied.
并研究了其最佳粒度比 、 重量比与流动相流速之间的最佳关系.
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The use of flou fluoride to protect teeth is common in many parts of the world.
用氟化物来保护牙齿在世界的许多地方都非常普遍.
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