放在凸透镜前10厘米高的蜡烛，通过凸透镜折射以后成的像高15厘米

【名词&注释】

多边形(polygon)、凸透镜(convex lens)

[单选题]放在凸透镜前10厘米高的蜡烛，通过凸透镜折射以后成的像高15厘米，则物距的范围在（ ）

A. 小于焦距
B. 大于焦距，小于2倍焦距
C. 大于2倍焦距
D. 无法确定

查看答案&解析查看所有试题

学习资料：

[单选题]5． You're too tired． You should __________for a few days．

A. lies down
B. lie
C. lay down
D. lie down

[单选题]3． _______the Great Green Wall，the land produces more crops

．

A. Thanks for
B. Thanks to
C. Thank to
D. Thank for

[单选题]15．

A. work
B. idea
C. box
D. think

[单选题]The Whites live in a small village． They have (11) small farm and they work there every day．They have a son， John． He is (12) ．He lives with them，(13) he doesn’t like to work in the village． He (14) to work in a city． He can (15) the gui-tar， and he can play it (16) ．Then he gets a job ( 17) a city．He (18)an art club．John likes his new work (19) ．He is very(20) ．( )11．

A. a
B. an
C. the
D. /

[单选题]下面各角能成为某多边形的内角和的是（ ）

A. 430°-
B. 4343°-
C. 4320° -
D. 4360°

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