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  • Nov 27
    2019
    Sandstone veins are earthquake-induced unconsolidated sandstones that penetrate into poorly permeable surrounding rocks (mudstone and shale are common) after liquefaction.
  • Nov 20
    2019
    It is interspersed with plate-like and vein-like sandstone bodies penetrating into the rock.
  • Nov 06
    2019
    Sandstone is the most widely used stone material by human beings.
  • Oct 15
    2019
    Classification by type of rock (mineral): quartz sandstone (quartz and various siliceous rock cuttings account for more than 95% of the total sand-level cuttings) and quartz complex sandstone...
  • Oct 01
    2019
    Divided by the diameter of the sand particles: giant sandstone (2 ~ 1mm), coarse sandstone (1 ~ 0.5mm)...
  • Sep 18
    2019
    Sandstone is a high-quality natural stone with no light pollution and no radiation, and has no radioactive harm to the human body.
  • Sep 06
    2019
    Sandstone is a type of sedimentary rock, which is formed by the erosion of stone particles on the river bed through water erosion.
  • Aug 28
    2019
    Sandstone is formed by accumulation of rocks in the source area through weathering, erosion and transportation.
  • Aug 15
    2019
    Sandstone is a type of sedimentary rock that is mainly cemented by various sand grains with a particle diameter of 0.05-2mm...
  • Aug 01
    2019
    1) Open holes in the corresponding part of the well of the rainwater well. The number and size of the holes are the same as those of the new curbstones; Should not be less than 15 °.
  • Jul 17
    2019
    The vertical mold is mixed with ordinary concrete and porous concrete for use...
  • Jul 02
    2019
    According to the thickness of the road surface layer and the type of the base layer, determine the thickness of the ordinary concrete on the road edge and the porous concrete on the lower layer...
  • Jun 20
    2019
    The internal surface of the cement surface structure leaks underwater to the top surface of the base layer, and the interface water between the same surface layer and the base layer (the main source of interface water...
  • Jun 01
    2019
    New type of curbstone for cement pavement, similar in dimensions to existing curbstones.
  • May 29
    2019
    The internal surface of the asphalt surface structure leaks underwater to the top surface of the base layer, and the interface water between the same surface layer and the base layer (the main source of interface water...
  • May 15
    2019
    As a new type of curbstone for asphalt pavement, its dimensions are similar to the existing curbstone.
  • May 01
    2019
    The upper layer of curbstone is made of ordinary concrete, and its impermeability can prevent the pavement rainwater from being poured into the pavement structure...
  • Apr 30
    2019
    The new curb stone adopts a double-layered upper and lower composite structure.
  • Apr 11
    2019
    Existing curbstones usually come in two forms, one is prefabricated for ordinary concrete, and the other is stone processing.
  • Apr 04
    2019
    Curb stone is a mark stone placed between the road surface and other structures.

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人妻 制服 出轨 中字在线