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【单选题】
The boy _____ is playing the piano is a friend of mine. [ ]A.
whose
B.
who
C.
whom
D.
which
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反馈参考答案：
举一反三
【简答题】根式 可以用分数指数幂表示为 ,其中m= .n= .
【多选题】在长期的中国革命战争实践过程中产生的毛泽东思想,系统地解决了( )等一系列问题, 形成了认识与指导战争和国防建设的完整的理论体系。
A.
中国革命战争中的指导路线
B.
方针政策
C.
战略战术
D.
建设与保卫国防
【单选题】_____ are generally formed in the frame. of the both in-line and Vee engines to give maintenance access to the crankshaft main and connecting rod large end bearing.
A.
Doors
B.
Aspirate gauzer
C.
Coupling
D.
Blind
【单选题】Doors are generally formed in the _____ of the both in-line and Vee engines to give maintenance access to the crankshaft main and connecting rod large end bearing.
A.
bedplates
B.
columns
C.
cylinder blocks
D.
safety caps
【单选题】With the intention of attracting a somewhat different type of passengers, the airlines have now begun to concentrate on ______.
A.
providing facilities enabling business travelers to work on board
B.
ensuring that the facilities offered to the executive are indeed superior
C.
organizing activities in which first-class passengers can participate
D.
installing sleeping compartments where more privacy is ensured
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