如图所示的几何体是由4个大小相同的小立方块搭成，它的俯视图是

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如图所示的几何体是由4个大小相同的小立方块搭成，它的俯视图是（）

A：

B：

C：

D：

上一题下一题 0.0难度选择题更新时间:2018-01-09 07:10:27

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C

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从下面方框中选择正确的单词并用其适当形式填空，使短文意思完整、通顺。

come, for, good, daughter, one, have, June, banana, when, we

Dear Jenny,

My name is Alan. I'm a 12-year- old girl. I'm the only ____ in my family. My birthday is on ____ 1st. It's the ____ day of the sixth month. It's also the Children's Day(儿童节). My parents ____ a party for me on that day. My friends ____ to the party. They bring(带来) me many birthday presents(礼物), and they sing Happy Birthday to me. ____ eat some strawberries, oranges and ____. We eat chicken and cakes ____ dinner. We also play games. We have a ____ time! How old are you? ____ is your birthday? Can you tell me?

Alan

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LED（发光二极管简称LED）是人类继爱迪生发明白炽灯之后最伟大的发明之一，它是一种新型节能、环保的光源产品．如图甲是一种常见的LED手电筒，发光元件由5个发光二极管并联组成，每个发光二极管的额定电流为30mA，它的能量是由可反复充电使用的电池提供，且LED灯发光的颜色会随电压的变化而变化，如表格所示．

两端的电压/V	2	2.4	3.2
LED灯的颜色	红	黄	蓝

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