Operator holds the values from the previous simple 运算符的结果集包含上一个简单
2.
An aircraft registered in hong kong may not fly for the purpose of public transport unless the operator holds an air operators certificate ( aoc ) granted by director - general of civil aviation 在香港的登记的飞机均不能用作公共运输用途,除非营运人(航空公司)已经持有民航处处长签发的经营许可证。