皮皮学，免费搜题
登录
搜题
【单选题】
下列应用化学科学对物质进行研究的基本方法或所得的结论，错误的是A.
氢气和甲烷的密度都比空气小，所以都可以用向下排空气法收集
B.
配制质量分数一定的溶液时，所用的烧杯必须是干燥的
C.
蜡烛燃烧后质量变小，说明质量守恒定律不是普遍规律
D.
通过测定两种稀盐酸的pH，可以比较它们的酸性强弱
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】根据括号内所给的词语,用现在完成时或一般过去时造句。 (1)(it/not/rain/this week) ___________________________________________________ (2)(the weather/be/cold/recently) ___________________________________________ (3)(it/cold/last...
【单选题】I recently read the Oxford 【C1】______ of the Tolstoy's War and Peace, translated by Louise and Aylmer Maude. 【C2】______ my shame, I had never read it before, so I was 【C3】______ to find myself reading...
A.
print
B.
publication
C.
issue
D.
edition
【简答题】For instance, something 1) _________ about my father was how he had 2) ___________ upon me from 3)__________ to love books and reading. In fact, this 4)___________ into a family habit of after-dinn...
【单选题】I recently read the Oxford【C1】______ of the Tolstoy's War and Peace, translated by Louise and Aylmer Maude.【C2】______ my shame, I had never read it before, so I was【C3】______ to find myself reading a ...
A.
print
B.
publication
C.
issue
D.
edition
【简答题】完形填空。 Recently, I stopped by a convenience store to get a newspaper and a bottle of drink. The young woman at the check-out counter said, 'That'll be five dollars 1 please,' She then 2 down at the pap...
【单选题】学汉语一定要坚持,不能三天打鱼,两天晒网。 *“三天打鱼,两天晒网”的意思是:
A.
做事或学习不能坚持
B.
很爱惜鱼网
C.
打到很多鱼
D.
把鱼网晒好了才能打到更多鱼
相关题目：