A.1/2 B.2/1 C.1/02 D.2/01
A.6~8 B.8~10 C.10~12 D.10
A.阿拉伯?dāng)?shù)字,從左至右 B.阿拉伯?dāng)?shù)字,從右至左 C.大寫(xiě)拉丁字母,從左至右 D.大寫(xiě)拉丁字母,從右至左