滴鼻药水时,应让小儿仰卧,肩下垫上枕头,使头后仰,鼻孔向上。或坐在椅上,背靠椅背,头尽量后仰。滴药后应保持原姿势()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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