铀金属质量浓度梯度变化规律明显；

The change of the mass concentration gradient of uranium metal is obviously regular.

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反应速率受试样中氧浓度梯度的限制。

The reaction rate is limited by the concentration gradient of oxygen in the sample.

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反应速率受试样中氧浓度梯度的限制。

She was driving at well over the speed limit.

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反应速率受试样中氧浓度梯度的限制。

What's the speed limit on the motorway?

youdao

反应速率受试样中氧浓度梯度的限制。

What's the speed limit on the motorway?

youdao