A:填湖造林
B:加强毁林开荒
C:植树造林
D:大量抽取地下水
工业上常用二氧化碳和氨气(化学式:NH3)反应来制取尿素化学式:CO(NH2)2,该反应的化学方程式为:CO2+2NH3CO(NH2)2+H20,现生产240t尿素,需要氨气的质量为多少?
我国四个直辖市中,距离嘉兴市最近的是( )
1个细菌细胞分裂5次后,产生子代细胞的数目是
Mr. Wang wants to go to the post ____. It's not far from his home. He walks ____Winter Street. He turns ____at Spring Street. Then he walks straight. It's over there. It's ____the flower shop and the ____.