A:铁和盐酸反应:2Fe+6H+=2Fe3++3H2↑
B:氯化铁和铜反应:Fe3++Cu=Fe2++Cu2+
C:将少量CO2通入澄清石灰水:CO2+Ca2++2OH-=CaCO3↓+ H2O
D:大理石与盐酸的反应:CO32-+2H+ = H2O + CO2↑
I like green dogs ____(和)blue cats.
如图所示,在汶川大地震中,一架直升飞机在灾区某地上空做定点空投救灾物资,已知由静止释放的一包物资,经5s刚好着地,忽略空气阻力的作用,g=10m/s2.求:
Going to the movies is good, ______ I really only like listening to music.