参考线平行布管-单参照线方式，可以参照的对象描述不正确的是（）
A.圆
B.圆弧
C.矩形框
D.块中的直线
参考答案：A
Your T-shirt is so cool. Could you tell me _____? [ ]
A. where you buy it
B. where do you buy it
C. where you bought it
D. where did you buy it
十进制数27的二进制表示为00011011b。
