Stair railing design concept considerations

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Stair railing design concept notes: 1. The height of the stair handrail (from the front line of the step) should not be less than 0.90m; the height of the outdoor stair handrail should not be less than 1.05m. 2. When the stairwell width is greater than 0.20m, the vertical clearance of the ha ...

Channel quality requirements

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The allowable deviation of the surface quality and geometry of the channel is specified in the standard. Generally, there must be no harmful defects on the surface, and there must be no significant torsion. The permissible values ​​of the channel wave bend (cutter bend) and the r ...

Gongyi Aluminum Industry relies on science and technolo…

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After a summary Earlier this year, Alpha Aluminum Gongyi listed companies rely on scientific and technological innovation, the progressive development of relatively high-end "double zero foil," which food foil, electronic foil, pharmaceutical foil accounted for 50% of national outpu ...

Introduction to quartz glass

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The mechanical properties of quartz glass are better than those of hard glass and ceramics, but the brittleness is poor. The theoretical calculation strength of quartz glass is very high, about 24×103 MPa, but the actual measured strength is several times lower than this value. The main fa ...

How to identify new and old wood

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Speaking of new material of lobular rosewood, many friends may not understand, what is the new material of lobular rosewood? By literally understanding, many friends think that the old and new materials are only a matter of time, in fact, this understanding is not comprehensive and inaccurate. ...

Siltstone classification

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Siltstone is divided into quartz siltstone, feldspar siltstone, lithic siltstone (rare) and the transition type between them according to the clastic composition. According to the composition of cement, it is divided into clay siltstone, iron siltstone, calcareous siltstone and dolomitic silts ...

Green radish keeps the oil green all the year round

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Green radish is the evergreen vine of Araceae. Stems are thicker and stronger, with aerial roots on the nodes; leaves ovate-shaped or ovate-elliptic, dark green, irregular yellow streaks or plaques often present on the leaves. Sexually warm, moist and semi-yin environment, should be loose and ...