题干

在相同状况下,将下列四种混合气体:1)体积比为3∶1的NH3和N2 2)体积比为1∶1的NO和NO3)体积比为1∶1的NO2和O4)体积比为4∶3的NO和O2分别置于完全相同的试管里,并倒置于水槽中。充分反应后,液面上升的高度分别为h1 h2 h3  h4则下列关系正确的是

A:h1> h2> h3>h4

B:h4> h3 >h2 > h1

C:h4 >h1 >h3 > h2

D: h2 >h1 >h3 > h4

上一题 下一题 0.0难度 选择题 更新时间:2010-07-07 08:19:14

答案(点此获取答案解析)

C

同类题5

阅读理解

    Life can be so wonderful, full of adventure and joy. It can also be full of challenges, setbacks and heartbreaks. Whatever our circumstances, we generally still have dreams, hopes and desires—that little something more we want for ourselves and our loved ones. Yet knowing we can have more can also create a problem, because when we go to change the way we do things, up come the old patterns and pitfalls  that stopped us from seeking what we wanted in the first place.

    This tension between what we feel we can have and "what were seemingly able to have is the niggling  suffering, the anxiety we feel. This is where we usually think it's easier to just give up. But we're never meant to let go of the part of us that knows we can have more. The intelligence behind that knowing is us—the real us. It's the part that believes in life and its possibilities. If you drop that, you begin to feel a little "dead" inside because you're dropping "you".

    So, if we have this capability but somehow life seems to keep us stuck, how do we break these patterns?

    Decide on a new course and make one decision at a time. This is good advice for a new adventure or just getting through today's challenges.

While, deep down, we know we can do it, our mind—or the minds of those close to us—usually says we can't.

    That isn't a reason to stop, it's just the mind, that little man or woman on your shoulder, trying to talk you out of something again. It has done it many times before. It's all about starting simple and doing it now.

    Decide and act before overthinking. When you do this you may feel a little, or large, release from the jail of your mind and you'll be on your way.