3.A line in general position 般位置直线 Definition The line being projected is oblique with the three planes of projection. 定义 与三个投影面都倾斜的直线称为一般位置直线。 d horizontal Obliquity Bis the oblique angles of the corresponding line formed with the frontal plane. 倾角 与H面的夹角：与y面的夹角：汽Y面的夹角釜 Profile The angle always>0°or<90°（夹角总是>0°或 <90° Characteristics Three projections on the projection planes are shorter than its true 投影特性 length,and all oblique angles are not true. 三投影均小于实长，其倾角均不反映真实大小。 痛陆银标左提显示后面肉V Z b´ B b" W  a´   X 0 A a" b a H Y 3. A line in general position 一般位置直线 Definition 定 义 Obliquity 倾 角 Characteristics 投影特性 请点击鼠标左键显示后面内容 X O YW YH Z a´ a b´ b b" a" The line being projected is oblique with the three planes of projection. 与三个投影面都倾斜的直线称为一般位置直线。 α horizontal βis the oblique angles of the corresponding line formed with the frontal plane. γ profile 与H面的夹角:α;与V 面的夹角:β;与W面的夹角:γ。 The angle always > 0°or < 90°( 夹角总是> 0°或 < 90° ) Three projections on the projection planes are shorter than its true length, and all oblique angles are not true. 三投影均小于实长，其倾角均不反映真实大小