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【单选题】
醋酸是一种常见的弱酸,为了证明醋酸是弱电解质,某同学开展了题为“醋酸是弱电解质的实验研究”的探究活动。他设计了如下方案,其中错误的是 [     ]
A.
先配制一定量的0. 10mol/L的CH 3 COOH溶液,然后测溶液的pH,若pH大于1,则可证明醋酸是弱电解质
B.
先配制一定量0. 01mol/L和0.1mol/L的CH 3 COOH溶液,分别用pH计测它们的pH,若两者pH相差小于1个单位,则可证明醋酸是弱电解质
C.
先测0.10mol/L CH 3 COOH溶液的pH,然后将其加热至100℃,再测pH,如果pH变小,则可证明醋酸是弱电解质
D.
配制一定量的CH 3 COONa溶液,测其pH,若常温下pH大于7,则可证明醋酸是弱电解质
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参考答案:
举一反三
【单选题】在信用证业务中,银行的责任是 ( )。
A.
只看单据不管货物
B.
只看货物不管单据
C.
既看货物又看单据
D.
看单据是否与货物相符
【单选题】有关紫外线消毒下述描述正确的是()
A.
空气消毒,每次照射时间一般为15~20分钟
B.
物品消毒,有效距离为2米
C.
消毒时间,需从灯亮5~7分钟后开始计时
D.
灯管表面应定期用清水擦拭
E.
室温越高,紫外线杀菌作用越强
【单选题】The ______ behaviour of the supporters of the football teams caused the police surround the football ground during the match.
A.
rough
B.
tough
C.
coarse
D.
harsh
【单选题】紫外线灯作物品表面消毒时,有效距离应小于
A.
2m
B.
3m
C.
3.5m
D.
4m
E.
1m
【简答题】影响财政支出规模的因素;
【单选题】The origin of the American party system can be traced to _______.
A.
the struggle between the Royalists and revolutionaries in the War of Independence
B.
the constitutional debate between the Federalists and the anti-Federalists
C.
the struggle between those who upheld slavery and those who opposed slavery
D.
none of the above
【单选题】听力原文: Police in Macedonia have arrested a journalist on suspicion that he was behind three murder cases he'd been reporting on. The journalist, Vlado Taneski, is accused of kidnapping, abusing and rap...
A.
his reports covered the confidential information.
B.
the three murder cases all involved elderly women.
C.
all the victims had some similarities with his late mother.
D.
he was responsible for the disappearance of a women.
【单选题】The police traced the thief to his hiding place.
A.
searched
B.
tracked
C.
vanquished
D.
located
【单选题】紫外线灯作物品表面消毒时,有效距离应为
A.
2m
B.
3m
C.
3.5m
D.
4m
E.
0.25~0.6m
【单选题】The passage suggests that the disparagement of rhetoric by some people can be traced to their______.
A.
reaction against science
B.
lack of training in logic
C.
desire to persuade people as completely as possible
D.
misunderstanding of the use of the term 'scientistic'
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