判斷題在鋼的編號中,65Mn表示平均含碳量為6.5%。

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5.單項選擇題

如圖所示,刀具起點(diǎn)在(-40,-20),從切向切入到(-20,0)點(diǎn),銑一個40mm的整圓工件,并切向切出,然后到達(dá)(-40,20)點(diǎn)。根據(jù)示圖中的刀具軌跡判斷,正確的程序是()。

A.……
N010G90G00G41X-20.0Y-20.0D01;
N020G01X-20.0Y0F200.0;
N030G02X-20.0Y0I20.0J0;
N040G01X-20.0Y20;
N050G00G40X-40.0Y20.0
……
B.……
N010G90G00G41X-20.0Y-20.0D01;
N020G01X-20.0Y0D01F200.0;
N030G02X-20.0Y0I-20.0J0;
N040G01X-20.0Y20;
N050G00G40X-40.0Y20.0
……
C.……
N010G90G00X-20.0Y-20;
N020G01X-20.0Y0F200.0;
N030G02X-20.0Y0I-20.0J0;
N040G01X-20.0Y20;
N005G01G00X-20.0Y20.0
……
D.……
N010G90G00X-20.0Y-20.0;
N020G91G01G41X20.0Y0D01F200.0;
N030G02X-20.0Y0I20.0J0;
N040G01X-20.0Y20.0;
N040G01X-20.0Y20.0;
……