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【单选题】
水灰比是指水泥浆中水与水泥的（）A.
密度之比
B.
质量之比
C.
体积之比
D.
细度之比
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【单选题】If you _________ your demand, then maybe you will have more chance of getting what you want.
A.
conduct
B.
dismiss
C.
grant
D.
moderate
【单选题】—How much if I wan to take one? —You can take as many as you like because they are free of _____.
A.
cost
B.
charge
C.
money
D.
pay
【单选题】Are You a Man or a Mouse? Are you a man or a mouse? When people ask this question they want to know if you think you are a brave person or a coward (懦夫). But you will never really know the answer to t...
A.
you are a tall person or a short one.
B.
you are a brave person or a coward.
C.
you are a human being or an animal.
D.
you enjoy real life or not.
【单选题】You should be confident and you have to learn to __________ your fear of class if you want to be a good teacher.
A.
get in touch in with
B.
get through
C.
get over
D.
get hold of
【简答题】从数据库的结构上看，数据库系统采用的数据模型有( )。 A) 网状模型、链状模型和层次模型 B) 层次模型、网状模型和环状模型 C) 链状模型、关系模型和层次模型 D) 层次模型、关系模型和网状模型
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