更多hexad例句

1. This is the hexad axis or hexagonal axis, for which the angle of rotation is 60, or one-sixth of 360.
2. Perpendicular to the hexad axis are six dyad axes of two kinds and each perpendicular to a vertical plane of symmetry.
3. In crystals of this division of the hexagonal system the principal axis is a hexad axis of symmetry.
4. Here there is a plane of symmetry perpendicular to the hexad axis; there is also a centre of symmetry.
5. The hexad axis is uniterminal and all the forms are open forms.