请简述无菌罐不能出现低液位的解决方法()
A.手动开阀将罐内的剩余料液排放完毕
B.将罐内的气全部排完
C.拆开检查低液位探头,包括接线柱,进行检查
参考答案:A, B, C
Mr. Andrew taught his students how to develop the basic skills in the physics class, ______ everything through jokes and experiments.
A.to explain
B.explained
C.explaining
D.explains
城市道路分为快速路、主干道、次干道与城市支路,一般干道间距为( )m,道路网密度为( )km/km2。
A.1000~1500,4~5 B.800~1200,3~4C.600~1000,2~3 D.500~800,1~2