The internationally recognized European Standard is EN 589. In the United States, tetrahydrothiophene (thiophane) or amyl mercaptan are also approved odorants, although neither is currently being utilized. An LPG regulator is a device that maintains a stable downstream pressure regardless of changes in gas flow and upstream pressure. Among them, the LPG jumbo regulator and the LPG quick-on regulator are typical representatives. http://www.peakgasregulator.com/gas-regulator/lpg-jumbo-regulator/

Hot dipped galvanized steel pipes are made by reacting the molten metal with the iron matrix to produce an alloy layer, so that the matrix and the coating are combined. Hot-dip galvanizing is to first pickle the steel pipe to remove iron oxide on the surface of the steel pipe. After pickling, it is cleaned in a tank of ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride, and then sent to a hot dip plating tank. http://www.ruijiesteelpipe.com/galvanized-steel-pipe/hot-dipped-galvanized-steel-pipe/

The USB cable is used for the connection and communication between the computer and external devices, and can also be used for the charging of the mobile phone and the connection with the outside, that is, for data transmission and charging. USB is the most widely used external bus standard in the PC field. It is used to standardize the connection and communication between the computer and external devices. The USB interface supports the plug-and-play and hot-swap functions of the device. http://www.toplinkall.com/usb-cable/

A catalytic converter is part of a car's exhaust system. Catalytic conversion device is an exhaust purification device that converts CO, HC, and NOx in exhaust gas into gases that are harmless to human body by using the action of catalyst, also known as catalytic conversion device. The catalytic conversion device converts the three harmful gases CO, HC, and NOx in the exhaust gas into harmless gases carbon dioxide, nitrogen, Hydrogen and water. http://www.xichuangcatalyst.com/catalytic-converter/

Stainless steel tube is a kind of hollow long round steel, which is mainly used in industrial transportation pipelines and mechanical structural components such as petroleum, chemical industry, medical treatment, food, light industry, mechanical instrument and so on. In addition, when the bending and torsional strength are the same, the weight is lighter, so it is also widely used in the manufacture of mechanical parts and engineering structures. http://www.chennamachinery.com/stainless-steel-tube/

1. Environmentally friendly, recyclable and easy to degrade; 2. Safe, no precipitation of harmful chemical elements; 3. User-friendly, no sharp burrs, etc. Disadvantages of injury: 1. High cost; 2. Hot drinks are easy to dissolve; 3. Hot-sealed drinks cannot directly pierce the cover; 4. It has a shelf life and has requirements for the preservation environment. Paper straws are mainly of great significance to environmental protection. http://www.degradabletableware.com/paper-straws/

The global computer bag giant HTTP company launched the world's first backpack in the 1980s. Due to the use of shock-proof protective materials, plus special ergonomic design and unique reinforcement, it is extremely durable and very popular. In addition to the shock-proof protective compartment specially used for holding the computer, the computer backpack also has a considerable space for small items such as luggage. Many high-quality computer backpacks are also widely used as sports travel bags. http://www.galaxytrendbags.com/backpack/computer-backpack/

Vacuum dryer is the equipment with the help of which vacuum drying is carried out. In the pharmaceutical industry vacuum dryer is known by a common name called vacuum oven. Vacuum dryers are sometimes made up of cast iron, but most now are made of stainless steel , so that they can bear the high vacuum pressure without any kind of deformation. The oven is divided into hollow trays which increases the surface area for heat conduction. http://www.gj-dryingequipment.com/vacuum-dryer/

Small dry-type transformers are often self-cooled by natural convection and radiation heat dissipation. As power ratings increase, transformers are often cooled by forced-air cooling, forced-oil cooling, water-cooling, or combinations of these. Large transformers are filled with transformer oil that both cools and insulates the windings. Transformer oil is a highly refined mineral oil that cools the windings and insulation by circulating within the transformer tank. http://www.hydgetpower.com/transformer/dry-type-transformer/

A decorative box is a form of packaging that is generally more than just functional, but also intended to be decorative and artistic. Many such boxes are used for promotional packaging, both commercially and privately. Historical objects are usually called caskets if larger than a few inches in more than one dimension, with only smaller ones called boxes. Traditionally gift boxes used for promotional and seasonal gifts are made from sturdy paperboard or corrugated fiberboard. http://www.ipackagingbox.com/paper-box/gift-box/