A:can’t
B:mustn’t
C:needn’t
D:shouldn’t
—May I help you?You seem to be having some problems.
—________,thanks. I think I can manage.
①铜与稀硝酸反应;
②铜与浓硝酸反应;
③铜先与氧气反应生成氧化铜,氧化铜再跟硝酸反应。以下叙述不正确的是