✔ 最佳答案
The first statement is false.
HCP is close-packing. It has closepacked planes.
The second statement is true.
FCC is close-packing, but BCC is not.
The third statement is true.
The last statement is true.
FCC unit cell has 4 atoms, while BCC unit cell has 2 atoms.
The answer:
(The first statement) The HCP unit cell has no closepacked planes.