题干

用以下三种途径来制取等质量的硝酸铜。(     )

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

A:三种途径所消耗铜的质量相等

B:三种途径所消耗硝酸的物质的量是①>②>③

C:途径③的制备方法最符合“绿色化学”理念

D:途径①中被氧化的铜与被还原的硝酸的物质的量之比是3:2

上一题 下一题 0.0难度 选择题 更新时间:2019-12-02 07:43:38

答案(点此获取答案解析)

B

同类题5

阅读下面短文, 从短文后各题所给的四个选项(A、B、C、D)中, 选出可以填入空白处的最佳选项。

    As children, our parents had dreams for us. They wanted us to do whatever was necessary to reach our highest 1. Later in life, friends and spouses (配偶) may also have schedules for us. People close to us may have ideas about  2 we should live our lives. The ideas usually  3 love and the desire for us to be happy. Other times, they come from a place of need within them—  4 it is the parent who wants us to  5 his or her dreams or the friend who wants us to play an already­defined role. We can appreciate and consider those people's input, but  6 we must follow our own inner guidance.

    There may come a time when all the suggestions can become  7. We may feel that the people we love don't approve of our judgment, which can  8 us to some extent. It can  9 the choices we make for our lives by making us  10 ourselves. It may also fill a void (空虚) with their  11 before we've had a chance to decide what we want. However, it can affect us  12 as well. We may have to  13 the feelings of resistance and to keep ourselves off from them. But we can take some time to  14 ourselves of any unnecessary doubts and go within to become  15 on what we desire for ourselves.

    We can tell our loved ones how much we  16 their thoughts and ideas, but that we need to live our own lives and make our own  17. We can explain that they need to let us learn from our own experiences  18 to rob us of wonderful life lessons and the opportunity to  19 our own judgment. When they see that we are happy with our lives, they can see all we need them do is to share  20 with us.