Chemical oxygen demand (COD) is a measure of the amount of oxygen required to oxidize organic and inorganic matter in water. COD 2 specifically refers to the second step in the COD test, where a strong oxidizing agent is added to the water sample to fully oxidize the organic matter present. This step helps to determine the total amount of organic pollutants in the water, providing valuable information about water quality and pollution levels. **

The amount of money that 2 people demand can vary widely depending on the context. For example, if 2 people are negotiating a business deal, they may demand a large sum of money for their services or products. On the other hand, if 2 people are simply splitting a bill for a meal or a shared expense, they may demand a much smaller amount. Ultimately, the amount of money that 2 people demand will depend on the specific circumstances and the nature of their relationship or transaction. **

To paint picks, you can start by cleaning them with a damp cloth to remove any dirt or debris. Next, you can use a primer specifically designed for metal surfaces to ensure the paint adheres properly. Once the primer is dry, you can use acrylic paint or spray paint to add color and design to the picks. Allow the paint to dry completely before using the picks for playing guitar. **

Double-sided picks are not necessary, but they can be useful for certain playing styles and techniques. They offer versatility by providing different tip shapes on each side, allowing for a variety of tones and playing options. Some guitarists prefer double-sided picks for their convenience and ability to switch between different playing styles without needing to change picks. Ultimately, whether double-sided picks are necessary depends on personal preference and playing style. **

The top 2 mangas are "One Piece" and "Naruto." "One Piece" is a long-running series that follows the adventures of a group of pirates as they search for the ultimate treasure. It has a huge fanbase and has been consistently popular for many years. "Naruto" is another highly popular manga that follows the story of a young ninja as he seeks recognition and dreams of becoming the strongest ninja in his village. Both of these mangas have had a significant impact on the genre and have captivated readers around the world. **

A tank top 2 is a sleeveless shirt that is similar to a traditional tank top, but with slightly different design features. It typically has a higher neckline and wider shoulder straps compared to a regular tank top. The tank top 2 is often made from lightweight and breathable fabrics, making it a popular choice for warm weather or for layering under other clothing. It can be worn as casual or athletic wear, and is a versatile addition to any wardrobe. **

It is not possible to provide a definitive answer to this question without more specific information. Prices on AliExpress can vary depending on the seller, the product, and any ongoing promotions or discounts. It is recommended to check the product listing on AliExpress to see the current price being offered by the seller. **

To paint guitar picks, you can start by cleaning the surface of the pick with rubbing alcohol to remove any oils or dirt. Next, use acrylic paint or nail polish to carefully apply your desired design onto the pick. Allow the paint to dry completely before adding a clear sealant to protect the design. Once the sealant is dry, your painted guitar pick is ready to use! **