通过改变汽蒸时的蒸汽压力和汽蒸时间，然后用白度仪测馒头白度值，最终确定提高馒头白度的最佳汽蒸压力和汽蒸时间。
By changing the steam pressure and The Times of steaming at the time of the steaming, to make the steamed bread respectively, and mensurate the whiteness.
通过改变汽蒸时的蒸汽压力和汽蒸时间，然后用白度仪测馒头白度值，最终确定提高馒头白度的最佳汽蒸压力和汽蒸时间。
By changing the steam pressure and The Times of steaming at the time of the steaming, to make the steamed bread respectively, and mensurate the whiteness.
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