【单选题】支气管扩张患者施行体位引流时,错误的护理是
【单选题】把牛顿环装置(透镜的折射率为1.52)由空气中移到水中,则干涉条纹
【单选题】Computer software that you can download from the Internet for a price is an artificially scarce good because it is _____ but _____ in consumption.
C.
nonexcludable; nonrival
【判断题】尺寸链是由封闭环和组成环(增环、减环)组成的。()
【单选题】我国于 1999 年《证券法》颁布实施后,证券发行制度改为( )
【单选题】支气管扩张患者在施行体位引流时,错误的护理理是
【单选题】An artificially scarce good is a good or service for which exclusion is _____ and which is _____ in consumption.
D.
not possible; nonrival
【单选题】A common resource is a good or service for which exclusion is _____ and which is _____ in consumption.
D.
not possible; nonrival
【单选题】A public good is a good or service for which exclusion is _____ and which is _____ in consumption.
D.
not possible; nonrival