旋转喷嘴式焚烧炉的辅助燃烧器在()应使其投入工作。
A.启动点火时
B.停用前
C.处理量太大时
D.A或B
参考答案:D
旋转喷嘴式焚烧炉的辅助燃烧器在()应使其投入工作。
A.启动点火时
B.停用前
C.处理量太大时
D.A或B
参考答案:D
完形填空。 | |||
The mountain town of Canton is at an elevation(海拔) of | |||
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