热风送粉的制粉系统由于三次风的风温较低,它的投入也相对降低了炉膛温度,使对流过热器区域换热减弱。
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(), the second one will start automatically.
A. If the first stand-by set failed
B. If the first stand-by set fails
C. If the first stand-by set will fail
D. If the first stand-by set doesn’t fail