线条的衔接训练方法是在一根直线、弧线或圆线的末端，再衔接一根延续的线条，尽量使线条与线条的衔接处不露痕迹。前后线条用笔要一致。
参考答案：对
I can remember well some pictures and the persons I saw in the room.
A．who
B．whose
C．whom
D．that
距离测试仪在测量高度时应平行于地面。（）
