【单选题】
液硫在___时流动性最好。
A. 130－160℃
B. 172±2℃
C. 170±2℃
D. 160±2℃
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答案
A
解析
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【单选题】
引循环水时，对冷换设备操作不正确的是： ___。
A. 冷换设备出口前的放空阀打开，将管道和冷换设备内的空气赶走
B. 引循环水越慢越好
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D. 先将循环水冷换设备中垃圾吹扫掉
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