诊断性胃镜检查者确保胃排空,术前至少要空腹()
A.4小时以上
B.1小时
C.2小时
D.3小时
参考答案:A
— Have you ever been to Taiwan, Jim?
— No. But I know it's _____ island. It's in the southeast of China. [ ]
A. a
B. an
C. the
铺设实木地板、实木集成地板、竹地板面层时,其木搁栅的截面尺寸、间距和稳固方法等均应符合设计要求。木搁栅固定时,不得损坏基层和预埋管线。木搁栅应垫实钉牢,与柱、墙之间留出()mm的缝隙,表面应平直,其间距不宜大于300mm。
A.10
B.20
C.30
D.40