题目内容

4G is characterized by high speed of data transfer and improved quality of sound.

A. 对
B. 错

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The goal set by ITU for data rates of WIMAX and LTE is to achieve 10Mbps when the user ismoving with high speed relative to the base station, and 100Mbps for fixed positions.

A. 对
B. 错

4G is set to find its way to mobile devices only restricted to 4G phones or laptops.

A. 对
B. 错

4G technology will provide the same level of security as 3G.

A. 对
B. 错

如果并励直流发电机的转速上升20%，则空载时发电机的端电压U0升高（）。

A、20%；
B、大于20%；
C、小于20%。
D. 不清楚