以下说法正确的是
A. 欧拉图一定是哈密顿图
B. 哈密顿图一定是欧拉图
C. 无向完全图既是欧拉图也是哈密顿图
D. 有向欧拉图和哈密顿图一定是强连通图。
白,绿,黑,白,浓,淡,干,湿水墨在纸上的变化显示着中国画的奥秘。Red, green, black, white, ____, ____, dry and wet changes of water and ink on paper show the ____ of traditional Chinese painting, guó huà.
绘画的工具和材料通常有毛笔、墨、颜料、宣纸、绢等。画笔的软硬、纸张对于水分的吸收、颜料的色彩表现都充分影响了中国画的特征。Tools and ____ involve ____, ink, coloure dink, rice paper and silk. The ____ of brushes, paper absorbency and colour determine the ____ of guó huà.
中国画注重水墨与线条。Water, ink and lines are the ____ for guóhuà.