A.CaCl2 B.NaCl C.SO2 D.Na2O
A.C4H9OH B.C6H5CH2OH C.CH3OH D.C6H5OH
A.試劑瓶瓶塞應(yīng)該倒放 B.試劑瓶標(biāo)簽應(yīng)向手心 C.滴定管讀數(shù)時(shí)應(yīng)看凹液面處所對(duì)應(yīng)的刻度 D.向滴定管中加標(biāo)準(zhǔn)溶液應(yīng)通過干凈的移液管,以防溶液撒出