A. 2~3,0.55~1.5 B. 2~3,0.75~1.5 C. 3~5,0.75~1.5 D. 3~5,0.55~1.5
A. 正确 B. 错误
A. 3~6d B. 0~3d C. 6~9d D. 9~12d