help me.

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help me.
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help me.
help me.
 

help me.
（1）温度达到着火点,有充足氧气
（2）有气泡生成；CaCO3+2HCL=CaCl2+H2O+CO2箭头
（3）紫色石蕊试液变红；H2O+CO2=H2CO3
(4)CO2密度比空气大

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