题目内容

移动通信中的下列哪个频段属于超短波的范畴()。

A. 720~800MHz
B. 806~960MHz
C. 1710~1880MHz
D. 2100~230MHz

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变直径管,直径D1=320mm,D2=160mm,流速v1=1.5m/s,v2为()

A. 3m/s
B. 4m/s
C. 6m/s
D. 9m/

Shell plating that has curvature in two directions and must be heated and hammered to shape over specially prepared forms is called().

A. compound plate
B. furnaced plate
C. flat plate
D. rolled plate

简述统一软件开发过程RUP的开发阶段。

油坊桥车场检修线的线路长度为()米。

A. 155
B. 156
C. 165
D. 166

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