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【简答题】
如图，在平面直角坐标系中，△ABC的三个顶点坐标分别为A（-2，-1）、B（-1，1）、C（0，-2）． （1）点B关于坐标原点O对称的点的坐标为______； （2）将△ABC绕着点C顺时针旋转90°，画出旋转后得到的△A 1 B 1 C； （3）在（2）中，求边CA所扫过区域的面积是多少？（结果保留π）． （4）若A、B、C三点的横坐标都加3，纵坐标不变，图形△ABC的位置发生怎样的变化？
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举一反三
【判断题】English as a Lingua Franca (ELF) refers to the use of English as a medium of communication between people of different languages.
A.
正确
B.
错误
【单选题】____refers to a set of words or terms that are shared by those with a common profession or experience.
A.
Dialect
B.
Lingua Franca
C.
Jargon
D.
Pidgin
【简答题】剪力墙由( )等构件组成。A. 剪力墙梁; B. 剪力墙身; C. 剪力墙洞口; D. 剪力墙柱; E. 地下室外墙
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【单选题】refers to the phenomenon that those who do not share a first language communicate with each other in a language that they know.
A.
national language
B.
lingua franca
C.
official language
D.
world language
【简答题】Lingua Franca refers to a specific __________ that is used as an
__________ means of __________. It holds __________ among different
groups of people.
【单选题】refers to the phenomenon that those who do not share a first language communicate with each other in a language that they know.
A.
official language
B.
lingua franca
C.
national language
D.
world language
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