这种在一定的温度和压力条件下使用的容器必须满足强度和密封性的要求，而焊接容器能充分满足这些要求。
The container used at specified temperature and pressure condition has to meet the requirements of intensity and airtightness, while weld container can completely meet these requirements.
中温沥青经过在一定的压力和温度下，经过一定时间热处理获得。
It is obtained by distilling soft pitch in modified pitch column under certain pressure and temperature after certain time heating.
中温沥青经过在一定的压力和温度下进行闪蒸获得。
It is obtained by distilling soft pitch in flash column under certain pressure and temperature.
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