如何处理再热器超压？
参考答案：
保护再热汽温和壁温不超温。
使用一二级旁路和向空排气门。
高再安全阀和低再安全阀。
________the workers were quite tired, _______ they still went on working.
A. Because; / B. Although; but C. Although; /
冲击座段修时有什么要求？
