The major causes of complication were wrong choice of cases and inadequate skill. Concl…
发生的原因主要是病例选择不当、技术不熟练及操作经验不足。
CONCL USION: Procaterol aerosol inhaler was effective and safe in mild and moderate bronchial asthma treatment.
结论：丙卡特罗气雾剂治疗轻中度支气管哮喘是有效而且安全的。
CONCL USION: the calculation formulas of multiple - stratifying and clustering random sampling are theoretically set up.
结论：推导并建立多重分层、整群随机抽样误差的计算公式。
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