Answer：The guitar has 6 strings and is adjusted to the standard sound. Under C, the 6-string name is E, and the nickname is mi. The 5-string name is A and the roll name is la. The 4-string name is D and the roll name is re. The 3-string name is G, and the roll name is sol. The 2 string name is B, and the nickname is xi. The 1 string name is E and the roll name is mi. On the notation, 1=G indicates that it is G, and 1=D is D. Simply put G as do and D as do. These are related to some basic music theory, I will give you the noun specific to yourself to understand more detailed. 1 tone name singular correspondence guitar standard tuning method. Twenty-two averaging law, the first singer name (by the way, the fixed singer name), natural major. The scale map downstairs is the C tuning diagram. If it is G, because G is used as do, and then according to the whole half and full half, you will get a brand new G tuning diagram.