显示四组实心图形 1. 按a—z四组图形元素由该符号组成，按其它键图形元素用？组成。 2. 按1—4键手动切换显示四个图形之一。 -Four groups showed a solid graphics. A-z according to four groups of symbols by the graphic elements of the graphic elements in accordance with other keys? Composition. 2. By man