填空题
按阀杆开启程度的不同，安全阀可分为（）和（）两种。
发布日期：2021-03-23
试题解析
安全阀
安全阀是启闭件受外力作用下处于常闭状态，当设备或管道内的介质压力升高超过规定值时，通过向系统外排放介质来防止管道或设备内介质压力超过规定数值的特殊阀门。安全阀属于自动阀类，主要用于锅炉、压力容器和管道上，控制压力不超过规定值，对人身安全和设备运行起重要保护作用。注安全阀必须经过压力试验才能使用。
- 中文名
- 安全阀
- 应用
- 锅炉
- 类别
- 自动阀
- 作用
- 控制压力不超过规定值，
两种
生活的尺寸就是欢喜与忧愁之间的拿捏与平衡。那些甘心付出的真、复水难收的伤没有甚么好脸红的。谁不是从欢喜找到自己；经过忧愁发现成熟？让我欢喜让我忧，生活是一出值回票价的好戏，有时欢喜有时忧，生命是一首怎么唱都唱不腻的好歌。在歌里，我们一直在一起。华健的世界是一个质朴平凡的有情天地，正因为平凡，他彷佛成为现代都会平凡大众的代言人。《让我欢喜让我忧》的空前成功，也标志着华语流行乐坛「周华健时代」的正式来临。
- 中文名
- 两种
- 歌曲原唱
- 周华健
- 谱曲
- 周华健
- 音乐风格
- 流行
- 发行时间
- 1991-11-01
- 所属专辑
- 让我欢喜让我忧
- 填词
- :武雄
- 编曲
- :
- 歌曲语言
- 普通话
阀杆
阀杆是阀门重要部件，用于传动，上接执行机构或者手柄，下面直接带动阀芯移动或转动，以实现阀门开关或者调节作用。
- 中文名
- 阀杆
- 作用
- 实现阀门开关或者调节
- 性能要求
- 足够的强度、良好的冲击韧性
- 外文名
- valve stem
- 材料
- 铜合金，碳素钢，不锈钢等
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