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Fine grain grade with high hardness and high toughness.
具有高硬度和高韧性，晶粒度为细级别的牌号。
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Natural test weight of grain seed is an important index of grain quality and grade.
粮食籽粒的自然容重是粮食质量和等级的重要指标。
youdao
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Natural test weight of grain seed is an important index of grain quality and grade.
粮食籽粒的自然容重是粮食质量和等级的重要指标。
youdao