问题
单项选择题
为控制温差应力,启动时锅筒内外壁温差及上下壁温差应不超过()。
A.30℃
B.50℃
C.60℃
D.70℃
答案
参考答案:B
为控制温差应力,启动时锅筒内外壁温差及上下壁温差应不超过()。
A.30℃
B.50℃
C.60℃
D.70℃
参考答案:B
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