【单选题】The keeper of the spring cleared away the leaves and branches, and wiped away the silt(淤泥) that would _______ have choked and polluted the fresh flow of water.
【单选题】菌落总数 ( GB4789.2-2016) 测定时,培养温度通常为( )。
【简答题】阅读理解。 A plant (植物) makes its own food in its leaves, water comes to the leaves through the roots (根), air gets into the leaves through very small holes (孔), the green coloring in the leaves uses the w...
【单选题】进行菌落总数 (GB4789.2-2016) 测定时,适宜计数范围是指( )。
【判断题】菌落总数 ( GB4789.2-2016) 的检验中,在计数时,应选择菌落在30~300的平板进行计数,如果所有的平板的菌落数均为零,则报告菌落总数为零。
【单选题】食品菌落总数( GB4789.2-2016 )测定,所用培养基是