尺寸是机械图样中的重要内容,国家制图标准对尺寸做了规定。 判断下列说法是否符合标注尺寸的基本规则或者规定。(符合在后面框内画√,不符合×,并填写正确的说法。) 图样中的尺寸以 mm 为单位时,不必标注计量单位的符号(或名称)。否则则必须注明相应的单位符号。
A.
正确
B.
错误
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