可与2，4-二硝基苯肼反应生成黄色沉淀的是（ ） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/bae956a55a934e888b1cabe17e68e866.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/a55be6cad4544a7198346aa1b73398f6.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/7f2334ba5b494271a31027c8f734ee66.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/7dd29a85700641d8baf1a329c5e5b142.png" />

2g氢气与2g氦气分别装在两个容积相同的封闭容器内，温度也相同。(氢气视为刚性双原子分子)。求：(1)氢分子与氦分子的平均平动动能之比；(2)氢气与氦气压强之比。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/a534e45a19e44cb5b635addbc32724c2.png"> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/5fafd6ca27be4fd79ef0df46c041a0bd.png"> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/ba4c959a181040bab18b9bfe72e6ecb1.png"> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/3189a9bc704b440a88b3b2bade9ff800.png">

两个体积相同的容器中，分别贮有氮气和氢气，若它们的压强相同，以E1和E2分别表示氮气和氢气的内能，则（ ） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/cc6a1dad7eb84fc7b7af4f45e5d73e77.png"> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/743111956c414d6cafee6d748946cbff.png"> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201712/11a18c44e18f431da261bfcd056b5c38.png"> D: 无法确定

设http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/6e6de13adf014e1f9fdc7954cb313377.png是由方程http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/6d1ea7ec74bb4607aee50aa325108197.png确定，求http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/1d60e0ceb7d14d26a00863c192e0bbf3.png（&nbsp; &nbsp; ）

设http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/90c19a717ac34717836dbca4afba1bd9.png是由方程http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/7648e783c2f24044bb84346d0e07e161.png确定，求http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/d24ed3aef9a94d38965289947da528f7.png（&nbsp; &nbsp; &nbsp;）