检查三证(适航证、国籍证、电台证)原件在位、完好、有效。( )
A.Check three licenses (Nationality Registration Certificate, Radio Operator's License, Airworthiness Certificate) are in place, good condition and effective B.Check three licenses (Airworthiness Certificate, Nationality Registration Certificate, Radio Operator's License) are in place, good condition and effective. C.Check three licenses (Radio Operator's License, Airworthiness Certificate, Nationality Registration Certificate) are in place, good condition and effective正确答案B
