电子湿度计可以直接测量溶液上部密闭空间的相对湿度，而不能直接测量溶液的活度。
An electronic hygrometer can be used to directly measure the relative humidity over the solution placed in hermetic room without direct measurement of its activity.
电子湿度计可以直接测量溶液上部密闭空间的相对湿度，而不能直接测量溶液的活度。
An electronic hygrometer can be used to directly measure the relative humidity over the solution placed in hermetic room without direct measurement of its activity.
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