Wang Nan Science and Technology is worth applying for, because the company is one of the world's major manufacturers of photovoltaic modules, leading the development of photovoltaic module technology, and has set a new world record for the conversion efficiency of polycrystalline batteries for many times, and the shipment of photovoltaic modules ranks among the top five in the world. The company's global layout and operation, involved in large-scale energy storage business, formed a first-Mover advantage; However, considering the recent depressed market sentiment and the expectation of overcapacity in the photovoltaic sector, it is recommended to purchase cautiously; This is actually quite tangled. After all, it is one of the leading companies with low valuation. I am optimistic about the reversal of the photovoltaic plate. Stock is a kind of valuable securities, which is a certificate issued by a joint stock limited company to prove the shares held by shareholders. Because stocks contain economic benefits and can be listed, circulated and transferred, stocks are also a kind of valuable securities. When trading in the stock market, investors need to know the basic knowledge such as trading time, marketing unit and trading system. The par value of a stock is the par value indicated by the joint-stock company on the par value of the issued stock. It takes yuan/share as the unit, and its function is to express the amount of capital contained in each stock. The face value of the shares circulating in China, Shanghai and Shenzhen stock exchanges is one yuan, that is, one yuan per share.