I often________him for advice on my work and he is always willing to________me some. A.give;ask B.ask;give C.ask;take D.give;give 答案:B下列实验“操作和现象”与“结论”都正确的是( )操作和现象结论A切开金属钠,钠表面的银白色会逐渐褪去Na在空气中会生成Na202B铝箔插入浓硝酸中,无明显铝与浓硝酸不反应C将FeCl2溶液滴加到少许酸性KMnO4溶液中,溶液褪色FeCl2具有漂白性D向Fe(NO3)2溶液中滴加稀硫酸和KSCN溶液,溶液变成红色溶液中有Fe3+生成
A、AB、BC、CD、D