base sand

基本解释

Shanghai Shibang has become a major production and export base of sand-stone and powder-making machinery in China.
上海世邦已成为国内主要的砂石、制粉机械生产和出口基地。
As the electric crawler inches forward along a sand base layer, the bricks are automatically packed together by gravity.
随着这个电动铺路者在砂基路面上一点点向前行进，砖块便因为地心引力自动码放在一起。
The effect of surface treatment of non silica base sand on the strength, gas evolution and breakdown of precoated sands has been investigated in the present work.
研究了表面处理工艺对覆膜特种砂强度、发气性及溃散性的影响；