【填空题】
171.氢气系统主要是冷却转子___和定子___，使其温度在允许范围内稳定运行。
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197.1号机高压缸通风阀主要目的是排掉汽轮机高压缸叶片___损失产生的热量,以避免叶片和内缸___，并列后关闭 。另一个作用在汽机跳闸时高排通风阀打开，有助于高压缸___排出，防止___。
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