题型:单项选择题 在铣削—个xY平面上的整圆时,圆的起点、终点为(一30,0),圆心点为(30,0)半径为60,圆的旋转方向为顺列针,则铣削圆弧的指令为()。A、G17G90G02X-30.0YOR-50.0F50B、G17G90G03X-30。0YOR-50.0F50C、G17G90G02X一30.0YO160JOF50D、G18G90G02X30.0YO160JOFSO 查看答案
题型:单项选择题 AccordingtoMARPOL73/78,Toenablepipesofreceptionfacilitiestobeconnectedwiththeship’sdischargepipelineforresiduesfrommachinerybilgesandfromoilresidue(sludge)tanks,bothlinesshallbefittedwithastandarddischargeconnectionthequantityoftheBoltsandnutsforthestandarddischargeconnectionis().A.5B.4C.6D.8 查看答案