机器装地线目的是（）。
A.防漏电
B.稳压
C.省电
D.方便
参考答案：A
— Why didn't you go to the movie yesterday?
— Because I ______ it before. [ ]
A. saw
B. have seen
C. have been seen
D. had seen
点缀色搭配的特点是怎样的（）
A、点缀色的色彩面积较小
B、点缀色和主体色彩的比例为6：4或7：3
C、点缀色和主体色彩为同类色
D、点缀色非常醒目、饱和度高
