A:Fe2+、Na+、Cl-、NO-3
B:K+、Ca2+、CH3COO-、HCO-3
C:Na+、Mg2+、NO-3、SO2-4
D:Ba2+、K+、Cl-、SO2-4
The movie was ________. I fell asleep half way through it.
当今的核电站是通过____ (选填“重核裂变”或“轻核聚变”)来释放核能的,如图为核电站发电流程图,在核电站发电过程中,能量转化的先后顺序是:____ 能、内能、____ 能、电能.