生物菌肥一亩地用大概用 2 公斤左右,微生物肥料是以微生物的生命活动导致作物得到特定肥料效应的一种制品,是农业生产中使用肥料的一种。
I understand that the code below would result segmentation fault because at the cstr of A, B::SYMBOL was not initialized yet. But why?