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[单选题]
焦炉煤气热值范围是()。
A.1800Kcal/m3左右
B.700~1000Kcal/m3
C.3900~4500Kcal/m3
查看答案
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A.1800Kcal/m3左右
B.700~1000Kcal/m3
C.3900~4500Kcal/m3
A.焦炉煤气﹥转炉煤气﹥高炉煤气
B.高炉煤气﹥转炉煤气﹥焦炉煤气
C.转炉煤气﹥高炉煤气﹥焦炉煤气
D.高炉煤气=转炉煤气﹥焦炉煤气
1100W钨丝灯在1800K温度下工作。假定可视其为黑体,试计算每秒钟内,在5000到5001
波长间隔内发射多少个光子?