Returns a design metric value , it must be converted to pixels and scaled for the font size 返回一个设计单位值,所以必须将其转换为像素并进行缩放以适合字号。
Standard specification for manufacture of reinforced concrete sewer , storm drain , and culvert pipe for direct design metric 直接设计的钢筋混凝土污水管雨水管和涵管的生产标准规范