遇水产生燃烧物的火灾，如金属钾、钠、碳化钙等，应用______灭火。
A．水 B．砂土C．二氧化碳 D．泡沫
参考答案：B
Twilight City (暮光之城)is the best movie _____ I _____ in the past eight years.[ ]
A. that; have seen
B. that; saw
C. which; have seen
D. which; saw
在原始溶液中，碳酸钠的含量越高，苛化率越高。
