题目7单选题
刀具起点在(-40,-20),从切向切入到(-20,0)点,铣一个Ф40mm的整圆工件,并切向切出,然后到达(-40,20)点.根据示图中的刀具轨迹判断,正确的程序是( ).<img src="https://tihai-oss-cloud.itihey.com/img/ef8172309e9b40fa07109a4cd9bc69dd.png">A. N010 G90 G00 G41 X-20.0 Y-20 D01;N020 G01 X-20.0 Y0 F200.0 ;N030 G02 X-20.0 Y0 I20.0 J0 ;N040 G01 X-20.0 Y20 ; N050 G00 G40 X-40.0 Y20.0B. N010 G90 G00 X-20.0 Y-20 ;N020 G01 X-20.0 Y0 F200.0 ;N030 G02 X-20.0 Y0 I-20.0 J0 ; N040 G01 X-20.0 Y20.0; N050 G01 X-20.0 Y20.0C. N010 G90 G00 X-20.0 Y-20.0;N020 G91 G01 G41 X20.0 Y0 D01 F200.0;N030 G02 X-20.0 Y0 I20.0 J0 ;N040 G01 X-20.0 Y20.0; N050 G01 X-20.0 Y20.0D. N010 G90 G00 G41 X-20.0 Y-20 D01;N020 G01 X-20.0 Y0 D01 F200.0 ; N030 G02 X-20.0 Y0 I-20.0 J0 ; N040 G01 X-20.0 Y20 ;N050 G00 G40 X-40.0 Y20.0