【多选题】【消耗次数：1】
关于螺纹退刀槽和砂轮越程槽，正确的描述是（）
①
先加工螺纹再加工螺纹退刀槽
②
先加工螺纹退刀槽再加工螺纹
③
先加工砂轮越程槽再磨削
④
先磨削再加工砂轮越程槽
参考答案：
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相关题目
【单选题】
下图中正确的退刀槽尺寸注法是（ ）
①
<imgwidth="149"height="157"src="http://wljy.whut.edu.cn:80/uploadfiles/word/gctx_zk006.files/gctx_zk0065985.png">
②
<imgwidth="191"height="158"src="http://wljy.whut.edu.cn:80/uploadfiles/word/gctx_zk006.files/gctx_zk0066089.png">
③
<imgwidth="158"height="137"src="http://wljy.whut.edu.cn:80/uploadfiles/word/gctx_zk006.files/gctx_zk0066193.png">
④
<imgwidth="170"height="156"src="http://wljy.whut.edu.cn:80/uploadfiles/word/gctx_zk006.files/gctx_zk0066297.png">
【多选题】
直螺纹接头的现场加工应符合下列规定（ ）。
①
钢筋端部应切平或镦平后加工螺纹
②
钢筋丝头长度满足企业标准中产品设计要求，公差应为0-2.0P
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钢筋丝头长度满足企业标准中产品设计要求，公差应为0-3.0P
④
镦粗头不得有与钢筋轴线相垂直的横向裂纹
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