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【单选题】
画螺旋弹簧时应注意以下几点( )A.
在平行于轴线的投影面上的视图中,其各圈的外形轮廓应画成直线;
B.
有效圈数在四圈以上的螺旋弹簧,允许每端只画两圈(支承圈除外),中间各圈要省略不画,而只画出通过簧丝断面中心的两条点画线,并可适当缩短整个图形的长度;
C.
弹簧在图上;右旋弹簧既可画成,也可画,但一律要注写旋向“右”字;
D.
示意图中标注的符号“Ф”或“□”,表示簧丝的断面形状是圆形或矩形。
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