A.長(zhǎng)徑3.0~4.0cm,寬徑1.5~2.0cm,厚徑0.5~1.0cm,峽部厚<0.4cm
B.長(zhǎng)徑4.0~5.0cm,寬徑2.0~2.0cm,厚徑1.0~1.5cm,峽部厚≤0.4cm
C.長(zhǎng)徑5.0~6.0cm,寬徑2.5~3.0cm,厚徑1.5~2.0cm,峽部厚>0.4cm
D.長(zhǎng)徑5.5~6.5cm,寬徑3.5~4.5cm,厚徑2.5~3.5cm,峽部厚≥0.5cm
E.長(zhǎng)徑4.0~5.0cm,寬徑2.5~3.0cm,厚徑0.5~1.0cm,峽部厚≤0.4cm