GSM系统，手机在通话TCH状态中每（）ms向网络提供一次测量报告，

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问题单项选择题

GSM系统，手机在通话TCH状态中每（）ms向网络提供一次测量报告，其中包含（）个TCH复帧。

A.480、21

B.480、4

C.3.69、21

D.3.69、4

答案

参考答案：B

阅读理解

Read and judge. 判断下面说法是否正确，正确的写“T”，错误的写“F”。

My name is Sarah. I'm eleven years old. I'm from America. In the morning, I eat hot dogs for breakfast.

Then I go to school. I study (学习) very hard. In the evening, I always (总是) watch TV before (在……之前)

supper. At 9:00 p. m., I go to bed.

( ) 1. Sarah is ten years old.

( ) 2. In the morning, Sarah eats hamburgers.

( ) 3. She goes to bed at 9:00 in the evening.

( ) 4. She always does her homework in the evening.

( ) 5. Sarah has hot dogs for her breakfast.

填空题

通电螺线管上方的小磁针静止时的指向如图所示，由此可知螺线管左端为______极，电源的左端为______极．