Which of the following chemicals will be used where protection against caustic cracking is required in boiler treatment?（）<br>A:Sodium hydroxide<br>B:Sodium carbonate<br>C:Sodium nitrate<br>D:Sodium polyphosphate

Which of the following chemicals will be used where protection against caustic cracking is required in boiler treatment?（）
A:Sodium hydroxide
B:Sodium carbonate
C:Sodium nitrate
D:Sodium polyphosphate

出自：海船船员证

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