需将一只220V，8W的指示灯安装在配电板上，电源电压为380V，应串

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问题单项选择题

需将一只220V，8W的指示灯安装在配电板上，电源电压为380V，应串接一只( )的电阻。

A．4.4kΩ，6W

B．4.4kΩ，5W

C．3.6kΩ，5W

D．3.6kΩ，6W

答案

参考答案：A

阅读理解

读短文，把正确的序号填在括号里。

A picture

Hello! I'm Tom. I have a picture. In the picture I can see a sheep in a white shirt, a dog in a red dress, a pig

in pink shorts, and a cat in yellow socks. They are playing on the farm. I like the picture.

1. How many animals do you see in the picture?

A. 3

B. 4

C. 5

D. 6

2. I can see _____________ in a red dress.

A. a sheep

B. a dog

C. a pig

D. a cat

3. I can see _____________ in a white shirt.

A. a pig

B. a dog

C. a sheep

D. a cat

4. What are they doing?

A. They are playing.

B. They are reading.

C. They are singing.

D. They are sitting.

5. Does Tom like the picture?

A. Yes, he does.

B. No, he doesn't.

C. No, he does.

D. Yes, he doesn't.

单项选择题 A1型题

特发性血小板减少性紫癜时做骨髓穿刺的目的是（）

A.证明有血小板减少

B.了解骨髓增生程度

C.了解有无合并缺铁性贫血

D.了解巨核细胞数量及有无成熟障碍

E.证明有血小板抗体存在