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单选题 3.在间接碘量法中,加入淀粉指示剂的适宜时间是
学科：默认课程
时间：2025-12-15 01:11:01
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题目1单选题
3.在间接碘量法中,加入淀粉指示剂的适宜时间是A. 滴定开始时B. 滴定近终点时C. 滴入滴定液近30%时D. 滴入滴定液近50%时
题目2单选题
7.下列有关淀粉指示剂的应用不正确的是A. 配制指示剂以选用直链淀粉为好B. 为了使终点颜色变化明显,溶液要加热C. 可加入少量碘化汞,使淀粉溶液保存较长时间D. 在间接碘量法中,淀粉必须在近终点时加入
题目3单选题
碘量法中使用碘量瓶的目的是A. 防止碘的挥发B. 防止溶液与空气接触C. 防止溶液溅出D. A+B
题目4单选题
10.KMnO 4法滴定溶液的常用酸度条件是A. 强碱B. 弱碱C. 强酸D. 弱酸
题目5单选题
14.间接碘量法使用的指示剂是A. 酚酞B. 铬酸钾C. 铬黑TD. 淀粉
题目6单选题
18.重氮化滴定法可用来测定A. 芳伯胺类化合物B. 芳仲胺类化合物C. 芳伯酸类化合物D. 芳仲酸类化合物
题目7填空题
Complete the sentence by using the appropriate forms of the words in brackets. 1) These _______ and powerful medical assistance actions have guaranteed the treatment of the disease. (mass) 2) It is essential that countries support each other, better ________ response measures and improve global public health governance. (coordinative) 3) We may at times encounter stormy waves and ________ rapids, but as long as we pool our efforts and keep to the right direction, the giant vessel of human development will stay on an even keel and sail toward a brighter future. (danger) 4) Having fully assessed difficulties and risks, we took the initiative to ______ a proactive strategy. (adoptable) 5) The League should be guided by the vitally ________ goal of making sure that the cause of the Party is carried forward by future generations. (importance) 6) Our original aspiration and mission are our inexhaustible source of _________ during our Long March. (motivational) 7) No matter how the international landscape may _______ and how strong we may become, China will never pursue hegemony or expansion, or seek to create spheres of influence. (evolve) 8) We need to work together to ________ peace and stability in the world. (maintainable)题目8单选题
Which of the following is not a color of the national flag of the Republic of IrelandA. RedB. GreenC. WhiteD. Orange
题目9单选题
In recent years, Ireland has attracted many international students for the following reasons except ________A. comparatively low living costB. high education qualityC. competitive tuitionD. convenient transportation
题目10单选题
"When You Are Old" is a poem written by_______, which inspired a Chinese musician who created a popular Chinese songA. George Bernard ShawB. W. B. YeatsC. Robert BurnsD. William Shakespeare
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