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Select the correct statement(s) about th...

Select the correct statement(s) about three-dimensional `hcp` system.

A

The number of atoms in `hcp` unit cell is six.

B

The volume of `hcp` unit cell is `24sqrt2r^(3)`.

C

The empty space in `hcp` unit cell is `26%`.

D

The base area of `hcp` unit is `6sqrt3r^(2)`.

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A, B, C, D
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