A.先讀整數(shù)后讀小數(shù) B.先讀小數(shù)后讀整數(shù) C.同時讀整數(shù)和小數(shù)
A.優(yōu)質碳素鋼 B.合金結構鋼 C.普通碳素鋼
A.1∶50 B.1∶25 C.1∶100