取四张湿润的蓝色石蕊试纸放在玻璃片上，然后按顺序分别滴加69%的

取四张湿润的蓝色石蕊试纸放在玻璃片上，然后按顺序分别滴加69%的硝酸、98.3%的硫酸、新制氯水、浓氨水，四张试纸最后呈现的颜色是

A．白、红、白、蓝 B．白、黑、白、蓝

C．白、白、白、蓝 D．红、黑、红、蓝

答案

相关题目

When I moved into an empty dorm for the first time two years ago, I was certain

When I moved into an empty dorm for the first time two years ago, I was certain of a few things. Firstly, I realized that I didn’t _1_ anybody at the school. Secondly, I knew that I wanted to work h

分别取pH=2的两种一元酸HX和HY的溶液各50 mL，加入过量的镁粉

分别取pH=2的两种一元酸HX和HY的溶液各50 mL，加入过量的镁粉，充分反应后，收集H2的体积在相同状况下分别为V1和V2，若V1＞V2，下列说法正确的是（

某批产品成箱包装，每箱5件．一用户在购进该批产品前先取

某批产品成箱包装，每箱5件．一用户在购进该批产品前先取出3箱，再从每箱中任意抽取2件产品进行检验．设取出的第一、二、三箱中分别有0件、1件、

下面能量转化过程中，主要发生了化学变化的是（） A．绿

下面能量转化过程中，主要发生了化学变化的是（） A．绿色植物将太阳能转化为化学能B．水力发电C．太阳能热水器烧水D．电热器取暖

It may be necessary to stop__in the learning process and go back to the diffi

It may be necessary to stop__in the learning process and go back to the difficult points in the lessons. A. at intervals B. at random C. at ease

（2009济宁）在体循环和肺循环中，血液流动的正确方向是（�

（2009济宁）在体循环和肺循环中，血液流动的正确方向是（）A. 心室→动脉→毛细血管→静脉→心房B. 心室→静脉→毛细血管→动脉→心房 C. 心房

When we went into the park, we saw someone _____ Chinese Kungfu. A. played �

When we went into the park, we saw someone _____ Chinese Kungfu. A. played B. to play C. playing

— My watch doesn’t work; I’ll get it _____. — Why not buy a new one. It

— My watch doesn’t work; I’ll get it _____. — Why not buy a new one. It’s too old. A. to repair B. repairing C. repair D. repa

取四张湿润的蓝色石蕊试纸放在玻璃片上，然后按顺序分别滴加69%的

答案

相关题目

最新题目