Control of the chemical purity of WFI presents few major problems.

注射用水化学纯度的控制是主要问题.

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All chemically pure art has this power to act upon us quickly and intensely.

一切有化学纯度的艺术都具备这种迅速而强烈地影响我们的力量.

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All certified batches of suck colors must meet stringent chemical purity standards in their manufacture.

所有这些法定的色素在制造时必须符合严格的化学纯度标准.

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