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5. There are two kinds of close packing in crystal structures. Some of the following information about the close packing may not be true. Please point the incorrect answer out.
(A) The types of close packing are cep and hcp.
(B) The atomic packing factor (APF) for the close packing is 74%.
(C) The body-centered cubic crystal structure is the type of ccp.
(D) The layer stacking for ccp is ABCABC, and that for hep is ABABAB.
(E) There are 4 atoms in the unit cell of ccp.



5. There are two kinds of close packing ..-阿摩線上測驗