good-quality sand 高质量砂
high quality sand body traps 优质砂体圈闭
molding sand quality 型砂质量
quality of sand mold 型砂品质
Green sand quality 湿型砂质量
quartz sand quality 石英砂品质
sand quality control 型砂质量控制
The lack of quality sand and stone resources and the deterioration of concrete durability have been two great problems to perplex the building trade in recent years.
优质砂石资源日益缺乏和混凝土耐久性差是近年来困扰建筑业的两大问题。
The high quality sand-body trap is characteristic of a large-scale trap, having furthersome types of reservoir facies and favorable reservoir, which are key factors for hydrocarbon enrichment.
优质的砂岩体圈闭具有圈闭规模大、发育有利的储集相类型和良好储集层的特点，这些是油气富集的关键因素。
USES material not qualified. Such as sand, stone, aggregate quality unqualified; In addition, mostly because cement volume expansion rate is too large (stability serious adverse).
所用材料不合格。如砂、石、集料质量不合格；除此之外，大多数是因为水泥体积膨胀率太大(安定性严重不良)。
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