本研究是依据霍尔的这一经典理论而开展的一个质化研究。
This research is a qualitative research according to Hall's classical theory.
YA系列圆振动筛是一种经典、通用且已标准化的筛分设备。
YA series circular vibrating screen is a classic, general and has standardized screen equipment.
YA系列圆振动筛是一种经典、通用且已标准化的筛分设备。
YA series circular vibrating screen is a classic, general and has standardized screen equipment.
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