Yes, when using "firstly, secondly, etc." in a sentence, it is common to separate them with a comma. This helps to clarify the sequence of the points being made and makes the writing easier to follow. For example, "Firstly, we need to gather the necessary materials. Secondly, we should prepare the workspace." **

The valves on heating pipes are typically ball valves or gate valves. Ball valves have a spherical disc inside that controls the flow of water by rotating the handle, while gate valves have a gate or wedge that moves up and down to control the flow. Both types of valves are used to regulate the flow of hot water through the heating system and can be manually operated to adjust the temperature or shut off the flow completely. **

For taking notes, jotting down ideas, and sketching, the Apple iPad Pro with an Apple Pencil is a popular choice among creatives and professionals. It offers a large screen, precise stylus, and a variety of note-taking and sketching apps. As for a good scanning app for iPhone diagrams, CamScanner is a highly recommended option. It allows you to easily scan, edit, and share documents and diagrams directly from your iPhone. **

Mangas can vary in their content, and while some may contain brutal images such as severed body parts, not all mangas are brutal. It ultimately depends on the specific genre and storyline of the manga. As for the second question, it seems to have been cut off. If you could provide the complete question, I would be happy to help answer it. **

You can find affordable cupping glasses at various online retailers such as Amazon, eBay, or specialty health and wellness stores. It is also possible to find them at local Chinese medicine shops or holistic health stores. As for whether it is better to buy glass cups and sterilize them after cupping, it ultimately depends on personal preference and convenience. Some practitioners prefer to use disposable cups for hygiene reasons, while others prefer to use glass cups and sterilize them after each use for sustainability and cost-effectiveness. **

Yes, the consumption of energy-saving pumps may increase when replacing heating pipes. This is because energy-saving pumps are designed to operate more efficiently and effectively with newer heating systems and pipes. The improved performance of the energy-saving pumps may lead to increased usage, as they are able to distribute heat more evenly and effectively throughout the system. Additionally, the replacement of old pipes with newer, more efficient ones may also contribute to increased energy consumption, as the system may be able to operate more efficiently overall. **

Some recommended mixers for cocktails include soda water, tonic water, ginger beer, and fruit juices such as orange, cranberry, and pineapple. These mixers can be used to create a wide variety of classic and modern cocktails, and can be easily combined with various spirits to create refreshing and flavorful drinks. Additionally, simple syrup and bitters are also commonly used as mixers to add sweetness and depth of flavor to cocktails. **

Suspension filtration works by passing a mixture of solid particles and liquid through a filter medium. The solid particles are too large to pass through the filter, so they are retained on the surface or within the pores of the filter. The liquid, which is now free of the solid particles, passes through the filter and is collected on the other side. This process separates the solid particles from the liquid, allowing for the purification or concentration of the liquid. **