单项选择题
A.油管短节下的油管长+生产管长+起爆器长+炮头长+总校正值B.油管短节下的油管长+生产管长+起爆器长-炮头长+总校正值C.油管短节下的油管长+生产管长-起爆器长+炮头长+总校正值D.油管短节下的油管长+生产管长-起爆器长-炮头长+总校正值
A.8mB.10mC.15mD.16m
A.1mB.0.8mC.0.6mD.0.4m