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General use cases, such as short distances (within 20, 30 meters), used in conference rooms, multi-function halls and other occasions, when the moving range is not large, you can choose a wireless microphone type with quartz oscillation and a single receiver, and the microphone head can choose to move Coil,  wireless microphone for sale  electret and other types, if conditions permit, phase-locked loop wireless microphones can also be selected. In performing arts bars, theaters and other occasions, due to the large range of activities, complex receiving conditions and high requirements, it is recommended to use PLL type and diversity type wireless microphones. If there are special requirements, musical instrument microphones, chorus microphones, etc. can also be used. In high-demand occasions such as large theaters and studios, it is recommended to use a well-known brand diversity wireless system with PLL receiving technology. In these occasions, the number of microphones is large, the

According to the molecular structure and characteristics of synthetic resins,  plastic molding size   it is divided into thermoplastics and thermosetting plastics. Thermoplastics: The molecular structure of synthetic resins in these types of plastics is linear or branched. Thermoset Plastics: The molecular structure of the resin in this type of plastic is ultimately a bulk structure. It has a linear structure at the beginning of heating. Therefore, it has plasticity and solubility, and can be molded into plastic parts of a certain shape. When the heating is continued, chemical bonds (ie cross-linking) are formed between the main chains of the linear molecules, and the molecules become network-like structures. It does not melt and does not melt, and the shape of the plastic part is fixed and will not change. like： Dimensions of plastic parts and their accuracy  What are the factors that affect the size of plastic molding Solution to dimensional deviation in plastic molding 

What is the effect of using a laser hair growth cap? Can you grow hair by irradiating the scalp with a laser?  loss hair   At first glance, it may not seem very reliable, but this therapy does have certain effects and can be used as a means of adjuvant therapy. Physical therapy has almost no side effects. At present, there are two kinds of drugs approved by the US FDA to treat hair loss, which are well-known minoxidil and finasteride. There is also a physical therapy that is actually helpful for the treatment of hair loss, that is, laser hair growth. The principle of laser hair growth: Simply put, laser hair growth stimulates the scalp through a fixed wavelength of laser light, enhances the activity of hair follicle cells, and achieves the effect of promoting hair growth. The domestic and foreign guidelines for the diagnosis and treatment of male alopecia also include laser hair growth, but only as an auxiliary treatment method, and laser hair growth with minoxidil is indeed better tha