But almost all the attention of the plastic shrinkage crack are focus on the medium and coarse sand concrete and the study of super fine one not found.
目前关于塑性收缩裂缝的研究几乎都集中在中粗砂混凝土，对于特细砂混凝土塑性收缩裂缝及其相关问题的研究几乎没有。
It suggests that the reservoirs with the branch channel sand in the delta plain and front and coarse to medium sandstones are the important exploration targets in the future.
建议今后勘探应注重三角洲平原亚相和前缘亚相的分支河道砂、河口砂坝中的块状粗—中砂岩储层。
The foundation of the dam for Dalong reservoir consists of the layer of medium-coarse sand with gravel, so it is difficult to be penetrated even by the high-power vibrator.
大隆水库大坝坝基为含卵砾中粗砂层，即使大功率振冲器也难以贯入。
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