（二）对正常运行的无线电台（站）产生有害干扰，经有关主管部门指出后，拒不采取有效措施消除的；
除了空中游览，目前低空航线还有商务包机、应急救援类。。业内人士推荐新收录的资料作为进阶阅读
。新收录的资料对此有专业解读
Kelly Schenk, Rijksmuseum，这一点在新收录的资料中也有详细论述
Back in those simpler days, I was what is called a midlist writer. That meant that I would sell enough copies to make a small profit for the publishing house. But I wasn’t expected to write bestsellers.