Square: the size varies from 130mmX 130mm to 150mmX 150mm, and the daughter card can usually be about 100mmX 100mm. Rectangular shape: the size varies from170mmx15mm to 190mmX 128mm, and the size should be changed in proportion to conform to the golden section. The secondary card should not be too big. Strip: the size ranges from 210mmx10mm to 250mmX 1 10mm, and the size shall be changed in proportion. The opening mode is only suitable for horizontal and unilateral opening.

1, square: the size varies from 130mmX 130mm to 150mmX 150mm, and the daughter card can generally be about 100mmX 100mm.

2. Rectangular shape: the size varies from170mmx15mm to 190mmX 128mm, and the size should be changed in proportion to conform to the golden section. The secondary card should not be too big.

3. Strip shape: the size varies from 210mmx10mm to 250mmx10mm, and the size will change with the proportion. The opening mode is only suitable for horizontal and unilateral opening.