coal pillar for sand proof 防砂煤柱
sand-proof 防风沙
sand proof well 防砂井
sand-proof pillar 防砂煤柱
helical sand-proof channel 螺旋防砂槽
sand proof efficiency period 防砂有效期
Adopt the sand-proof structure design for the whole water pump, bring down the damage to pump itself.
水泵整体采用抗沙性结构设计，降低了水井沙子对水泵的损坏程度。
The high temperature foamed ceramic with water all proof and thermal insulation has been trial - produced by using local porcelain sand and cullet.
利用地方瓷砂原料和废碎玻璃试制了具有防水、保温功能的高温发泡陶瓷。
The green sand mold with even density and proof of the impact of liquid metal is one of the critical factors in the production of quality casting.
紧实度均匀、能抵抗金属液体冲击的合格砂型是保证铸件质量的关键因素之一。
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