西瓜和葡萄等水果吃起来都有甜甜的汁液，这些汁液存在于（）

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问题选择题

西瓜和葡萄等水果吃起来都有甜甜的汁液，这些汁液存在于（　　）

A．细胞核中

B．细胞质中

C．液泡中

D．叶绿体中

答案

答案：C

单项选择题

开角是

A．窗户的有效透光面积与居室地面积之比
B．由工作面中心至窗上缘连线与工作面水平线之夹角
C．室内工作点至对侧窗外遮光物上端的连线与该室内工作点至窗上缘连线之间的夹角
D．室内水平面上散射光照度与同时间同高度的室外空旷处的散射光照度之比
E．由人工光源发生的照度
下列各采光指标的概念

选择题

( ) 1.	A. I like Mondays. We have music class. B. I like Mondays. We have P. E. class. C. I like Mondays. We have art class.
( ) 2.	A. You can play computer games on Sundays. B. You can read books on Sundays. C. You can do your homework on Sundays.
( ) 3.	A. Sarah can cook the meals. B. Sarah can water the flowers. C. Sarah can empty the trash.
( ) 4.	A. There is a telephone on the end table. B. There is a telephone near the end table. C. There is a lamp on the end table.
( ) 5.	A. There are tall buildings in the city. B. There are tall buildings in the village. C. There are tall buildings in the nature park.