分析了锅壳锅炉后管板裂纹产生的原因，阐述了事故发生的机理和处理方法。
The causes resulting in cracks in back tube sheet of shell type boilers are analyzed. The mechanism of accidents is stated and some relative solutions to the problem are presented.
当晶体管测温器接到后板上并且其温度在-20度到60度之间时，这盏灯就亮了。
The lamp lights when the transistor temperature probe is connected to the rear panel and its temperature is between -20~60’C.
威尔士先生称，一旦控制板已经重新被安装在防喷阀上，管汇连接在Q 4000后，就要实施灭顶法了。
Mr Wells says that once the control pod has been reinstalled on the blowout preventer and the manifold is attached to the Q4000, the top kill could start.
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