With the increase of the ratio the density of the sample increases at first and then decreases when the ratio reaches certain critical value and the mach pore is decrescent at first and later largens.

随装药比的增大，马赫孔从有到无，但当装药比继续变大时，则会再次出现马赫孔且有增大的倾向；

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With the increase of the ratio the density of the sample increases at first and then decreases when the ratio reaches certain critical value and the mach pore is decrescent at first and later largens.

随装药比的增大，马赫孔从有到无，但当装药比继续变大时，则会再次出现马赫孔且有增大的倾向；

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