Steel pipes are steels with a hollow cross-section whose length is much greater than the diameter or circumference. According to the cross-sectional shape, it is divided into circular, square, rectangular and special-shaped steel pipes; according to the material, it is divided into carbon steel pipes, low-alloy structural steel pipes, alloy steel pipes and composite steel pipes; Steel pipes for thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, high-pressure equipment, etc.
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The longitudinal bar of the spike-tooth rake is in a "Z" shape, and the spikes are arranged at the intersection of the longitudinal bar and the horizontal bar. Combine 3 to 4 longitudinal bars in a "Z" shape with 3 to 5 horizontal bars as a section, and then use a rigid traction frame to connect several sections. Because each section can swing independently, the spiked rake can well adapt to uneven terrain, and the work is relatively stable.
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Large-scale industrial ceiling fans like HVLS Fans and PMSM Fans have large exhaust volume and wide coverage. There are many differences between industrial ceiling fans and ceiling fans for domestic applications. First, there is a huge difference in body size. Secondly, the industrial ceiling fan adopts the variable cross-section streamlined design to make its coverage rate large, because this type of design can reduce the frictional resistance in the air
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Besides, there is another equipment using hihg voltage. The high voltage divider is a special instrument for on-site measurement, which can measure both DC high voltage and AC high voltage. The whole equipment consists of a voltage divider and a measuring instrument. The voltage divider adopts a balanced equipotential shielding structure, and high-quality electronic components are used inside the completely sealed insulating cylinder
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Unbalanced muscle training not only occurs in the body of fitness novice, but even experienced drivers cannot escape this problem. The muscles of the left and right arms or legs are unbalanced. When training on one side, it is necessary to strengthen the weak link, and dumbbells are sufficient for fitness practitioners. It can not only make up for the exercise, but also maintain the balance of the muscles on both sides of the thigh.
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The concept of smart home originated very early, but no specific construction cases appeared until 1984, when United Technologies Building System applied the concept of building equipment informatization and integration to Hartford, Connecticut, USA. The first "smart building" appeared in the City Place Building, which opened the prelude to the world's scramble to build smart homes.

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The air filter replacement is mainly used to purify the intake air and remove the dust particles. In addition, the exhaust gas of some production processes contains fine pollutants (such as radioactive substances, oil mist, etc.) although this type of purification belongs to exhaust gas purification, due to its high purification requirements, an air filter is also required. The characteristics of air purification are low dust concentration and fine dust particles in the treated air
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