A.1:2:3:4:5:6:8:9...B.2:4:6:8:10:12:14...C.3:4:8:9:12...
A.(h+k+l)=奇數(shù)B.(h+k+l)=偶數(shù)C.(h+k+l)=偶數(shù)或奇數(shù)
A.反B.正C.等