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【简答题】
科技考古学的主要理论有均变论、进化论和 。
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【简答题】电动天窗系统的电动机采用的是双向直流电动机,它是通过改变电动机 的方向控制天窗开关。
【简答题】电动天窗系统的电动机采用的是双向直流电动机,它是通过改变电动机的( )方向来控制天窗的开和关。
【简答题】__________ David __________ Charles may go to the party because one of them must stay at home. A. Neither , nor B. Both , and C. Either , or D. Not only , but also
【单选题】__________ David __________ Charles may go to the party because one of them must stay at home.
A.
Neither , nor
B.
Both , and
C.
Either , or
D.
Not only , but also
【简答题】词组大比拼 照顾,照料,关怀_________
【单选题】( )28.Which is true about David and Mike?
A.
They both like sports very much.
B.
They both enjoy studying.
C.
They are both students.
D.
They are both teachers.
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