AOPA

A study on high solid content and stable emulsifier free emulsion polymerization that added with AOPA

AOPA用于高固含量稳定无皂乳液聚合的研究

Conclusion Echocardiography is an effective method in the diagnosis of AOPA , and the surgical treatment has good results .

结论超声心动图是诊断AOPA的有效方法，外科手术治疗效果满意。

Objective To analyze the echocardiographic diagnosis and surgical treatment experience of anomalous origin of one pulmonary artery ( AOPA ) .

目的分析单侧肺动脉起源异常（AOPA）的超声心动图诊断及外科治疗经验。

AOPA - Aircraft Owner & Pilot Association

飞机所有者及飞行员协会

By the end of June , 5047 people in China held a drone certificate , according to statistics from the Aircraft Owners and Pilots Association ( AOPA ) .

航空器拥有者及驾驶员协会（AOPA）的数据显示，截至今年6月底，全国有5047人持有无人机驾驶证。

Not everyone needs a certificate to fly a drone ; if a drone weighs less than 7 kg , if it is flown indoors or in sparsely populated areas , then a certificate is not required , the AOPA says .

AOPA表示，并非所有人都需考证才能操控无人机。操控7公斤以下无人机，在室内或非人口稠密区操控无人机，则不必考证。