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【单选题】
When I first entered university, my aunt, who is an English professor, gave me s new English dictionary. I was __36___to se that it was an English English dictionary, also known as a monolingual dictionary._37___it was a dictionary intended for non—native learners, none of my classmates had one __38__, to be honest, I found it extremely __39_ to use at first. I would look up words in the dictionary and _40__ not fully understand the meaning, I wad used to the __41__ bilingual dictionaries, in which the words are _42__ both in English and Chinese ,i really wondered why my aunt __43_ to make things so difficult for me. Now ,after studying English at university for three years, I _44__ that monolingual dictionaries are __45_ in learning a foreign language As I found out, there is __46_ often NO perfect equivalence(对应)between two _47___ in two language. My aunt even goes so far as to 48___ that a Chinese “equivalent” can never give you the __49___ meaning of a word in English! ___50_ , she insisted that I read the definition(定义) of a world in a monolingual dictionary __51___ I wanted to get a better understanding of its meaning. ____52__, I have come to see what she meant. Using a monolingual dictionary for learners has helped me in another important way. This dictionary uses a(n) 53 number of words, around 2, 000, in its definitions. When I read these definitions, I am 54 exposed to(接触)the basic words and learn how they are used to explain objects and ideas. 55 this, I can express myself more easily in English.
A.
worried
B.
sad
C.
surprised
D.
nervous
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【单选题】某精馏塔用来分离双组分液体混合物,进料量为 100Kmol/h ,进料组成为 0.6 , 要求塔顶产品浓度不小于 0.9 ,以上组成均为摩尔分率,则塔顶产品最大产量为( )。
A.
100kmol/h
B.
66.7Kmol/h
C.
60Kmol/h
D.
不确定
【单选题】某精馏塔用来分离双组分液体混合物,进料量为100kmol/h,进料组成为0.6 ,要求塔顶产品浓度不小于0.9,以上组成均为摩尔分率,则塔顶产品最大产量为( )。
A.
60.5kmol/h
B.
66.7kmol/h
C.
90.4kmol/h
D.
不能确定
【单选题】某精馏塔用来分离双组分液体混合物,进料量为 100Kmol/h ,进料组成为 0.6 , 要求塔顶产品浓度不小于 0.9 ,以上组成均为摩尔分率,则塔顶产品最大产量为( )。
A.
60.5kmol/h
B.
66.7Kmol/h
C.
90.4Kmol/h
D.
不能确定
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A.
正确
B.
错误
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A.
扑尔敏
B.
苯海拉明
C.
布克利嗪
D.
赛庚啶
【简答题】简述一般控制和管理控制的异同。
【单选题】某精馏塔用来分离双组分液体混合物,进料量为100kmol/h,进料组成为0.6,要求塔顶产品浓度不小于0.9,以上组成均为摩尔分率,则塔顶产品最大产量为()。
A.
60.5kmol/h
B.
66.7Kmol/h
C.
90.4Kmol/h
D.
不能确定
【简答题】简述一般控制和管理控制的异同。
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A.
正确
B.
错误
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A.
60.5
B.
80.0
C.
90.4
D.
不能确定
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