皮皮学，免费搜题
登录
搜题
【多选题】
下列关于浓度的说法,正确的是A.
摩尔浓度系指1升溶液中所含溶质的摩尔数表示的浓度
B.
百万分浓度系指一百万份重量的溶液中所含有溶质的重量份数表示的溶液浓度
C.
比例浓度系指1份溶质重量与溶液体积份数的比例公式来表示的溶液浓度
D.
百分浓度包括重量比重量百分浓度、重量比体积百分浓度、体积比体积百分浓度
E.
1*10-6即表示百万分之一的浓度。
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
【单选题】Why did the man start to teach English part-time?
A.
The owner of the school promised him a good position.
B.
He could earn more as a teacher than as a travel agent.
C.
He wanted to earn more to support his family.
D.
He enjoyed teaching English.
【单选题】Why did Webster write A Grammatical Institute of the English Language?
A.
He wanted to supplement his income.
B.
There were no books available after the Revolutionary War.
C.
He felt that British books were not appropriate for American children.
D.
The children did not know how to spell.
【单选题】—Why did you come back so early last night? —There was at the English corner.
A.
something interesting
B.
interesting nothing
C.
nothing interesting
【简答题】为什么说营销策划是市场营销系统工程?
【单选题】Why did the author believe that the influence of American English on British English is very noticeable?
A.
Because when his son-in-law used some words typical of American English he barely recognized them.
B.
Because his daughter, as a native from Britain, is starting to use words typical of American English.
C.
Because there are quite a number of words that have both British and American variants.
【简答题】熔断器主要有____、____和____三部分组成。
【单选题】Why did the man start to teach English part time?
A.
He enjoyed teaching English.
B.
He wanted to earn more to support his family.
C.
The owner of the school promised him a good position.
D.
He could earn more as a teacher than as a travel agent.
【简答题】数据通信系统主要有_______、_______和_______三部分组成。
相关题目：