Both Timo Boll and Zhang Jike are professional table tennis players sponsored by Butterfly, a popular table tennis equipment brand. Timo Boll uses the Timo Boll ALC blade, while Zhang Jike uses the Zhang Jike ALC blade. Both blades are designed to suit the playing style and preferences of each player, with the ALC (Arylate Carbon) material providing a good balance of speed and control. Ultimately, the choice between the two blades comes down to personal preference and playing style. **

No, real gold cannot rust. Rust is a chemical reaction that occurs when iron or other metals oxidize, but gold is a noble metal and does not react with oxygen. This is one of the reasons why gold is highly valued and sought after for its durability and resistance to corrosion. However, gold can still be affected by other chemical reactions or environmental factors that may cause it to tarnish or discolor over time. **

Yes, real silver can tarnish, which is a form of corrosion that gives silver a dull, darkened appearance. This tarnishing occurs when silver comes into contact with sulfur compounds in the air or on the skin. However, unlike iron or steel, silver does not rust in the same way. Instead, it forms a tarnish layer that can be easily removed with polishing. **

Real gold does not rust because it is a noble metal, meaning it is resistant to corrosion and oxidation. Unlike iron or steel, which can rust when exposed to moisture and air, gold remains unaffected by these elements. This is one of the reasons why gold has been highly valued throughout history and is often used in jewelry and other decorative items. However, it is important to note that gold can still be scratched or dulled over time through wear and tear. **

Ethanol is not considered a universal solvent because it cannot dissolve all substances. While ethanol is a good solvent for many organic compounds, it may not dissolve certain inorganic substances or nonpolar molecules. Water is often considered a universal solvent because it can dissolve a wide range of substances due to its polar nature. Ethanol's solvent properties are limited to certain types of compounds, making it not universally effective for dissolving all substances. **

The strongest solvent is typically considered to be sulfuric acid. It is a highly corrosive and powerful acid that can dissolve a wide range of materials, including metals, organic compounds, and even some plastics. Sulfuric acid is commonly used in industrial processes, laboratory settings, and chemical manufacturing due to its ability to dissolve a variety of substances. However, it is important to handle sulfuric acid with extreme caution due to its highly corrosive nature. **

A hard solvent is a type of solvent that has a high solvency power and is capable of dissolving a wide range of substances, including oils, greases, and waxes. These solvents are often used in industrial cleaning applications, such as degreasing metal parts or removing tough stains. Hard solvents are typically more aggressive and can pose health and environmental risks, so they should be handled with care and used in well-ventilated areas. Examples of hard solvents include mineral spirits, acetone, and methyl ethyl ketone. **

A thermoplastic with solvent is a type of material that can be dissolved in a solvent, making it easier to manipulate and shape. When the solvent evaporates, the material solidifies, retaining its new shape. This property makes thermoplastics with solvent ideal for applications where precise shaping and molding are required, such as in the production of plastic films, coatings, and adhesives. **