锅炉还可分成自然的或动力的通风类型.Boilers are also classed as natural or forced draft types.转子不能停在任意位置或动力不平衡.The rotor should not stop at any position or power imbalance.7.人工或动力执行机构:请包括所要求的技术细节.Manual or power actuators, please include ...