男性,67岁,因胆囊炎并发胆结石在全麻下接受腹腔镜胆囊切除术,为预防病人术后出现肺不张,最有效的方法是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧