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【单选题】
螺纹连接时,弹簧垫圈的作用是为了()。A.
连接
B.
镜紧
C.
防松
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皮皮学刷刷变学霸
举一反三
【简答题】He/she has a background of studying chemistry.
【单选题】He is an expert at chemistry.We all call him a ________
A.
chemistry
B.
chemica
C.
chemist
D.
physician
【简答题】What has made John so surprised? A．He discovered he wasn't registered in Chemistry 302A. B．He discovered he was registered in Chemistry 302B. C．He didn't know he was registered in Chemistry 302A and 3...
【简答题】选择正确的键联接的画法____
【单选题】He is an expert at chemistry.We all call him a ________.
A.
chemistry
B.
chemical
C.
chemist
D.
physician
【简答题】He gives students lessons at a school.
【单选题】The enclosures of the 1th and 18th centuries meant that_______．
A.
people were no longer legally entitled to own land
B.
people were driven to look elsewhere for means of supporting themselves
C.
people were not adequately compensated for the loss of their land
D.
people were badly paid for the work they managed to find
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