问题
单项选择题
一个中频加热电源，频率为10000HZ，则电流的周期为（）。
A.0.1S
B.0.001S
C.0.0001S
D.0.01S
答案
参考答案：C
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一个中频加热电源，频率为10000HZ，则电流的周期为（）。
A.0.1S
B.0.001S
C.0.0001S
D.0.01S
参考答案：C
| 阅读理解。 |
| This is our classroom. It is a new room. (1)There are four windows in the walls. The walls are white. There is a map of China on the back wall. (2)教室里有五十五张桌椅.They are for our students . There is a big desk over there, too. It's the (3) _____desk. We like all our teachers very much. |
| 1. 将(1)处的英文译成汉语。 ________________________。 2. 将(2)处的汉语译成英文。 ________________________. 3. 在(3)处的空白处填上适当的单词。 ________________________. 4. 从文中找出与下列句子意思相近的句子。The room is new. ________________________. 5. 给文章加上合适的标题。 ________________________. |