【单选题】【消耗次数：1】
采用第一角画法绘制的图样，在标题栏中( )
①
不必画出第一角画法的识别符号
②
必须画出第一角画法的识别符号
③
可画可不画第一角画法的识别符号
④
国标没有规定
参考答案：
复制
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