单选题Which of the following chemicals will be used where protection against caustic cracking is required in boiler treatment?（）ASodium hydroxideBSodium carbonateCSodium nitrateDSodium polyphosphate
单选题
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
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