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燃气表外壳材质
Time：2021-11-04 10:44:34
燃气表外壳主要由合金铝压铸而成，燃气表与古老的火车头有着相同的原理，靠燃气的压力对外做功，推动滚轮计数器计数。具体怎么做呢？把火车头中的汽缸、活塞机构大大简化一番，用“风箱”代替汽缸，用“薄膜”代替活塞。所谓“风箱”不过是用金属做成的空盒子而已，盒子由两半拼起来，中间夹一张柔软而不透气的薄膜。
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