____Nice to meet you.
____Hello, Li Mei.
____She's my friend.
____Nice to meet you, too.
____Hi, Fang Fang.
____Li Mei, this is Fang Fang.
____ P+____O2 点燃_ ____P2O5
____ Fe2O3+____C 高温_ ____Fe+____CO2
____ Fe2O3+____CO 高温_ ____Fe+____CO2.
商朝是我国青铜文明的灿烂时期。世界现存最大的青铜器是商朝的( )