A.木抹子B.鉗子C.線墜D.水平尺
A.兩位小數(shù)B.三位小數(shù)C.整數(shù)D.一位小數(shù)
A.(70±2)℃和/或(50±2)℃B.(23±2)℃C.(5±2)℃D.(23±2)℃和/或(50±2)℃