它是金屬材料的重要性能指標之一。一般硬度越高，耐磨性越好。常用的硬度指標有布氏硬度、洛氏硬度和維氏硬度。布氏硬度（HB）以一定的載荷（一般3kg）把一定大�。ㄖ睆揭话銥�1mm）的淬硬鋼球壓入材料表面，保持一段時間，去載后，負荷與其壓痕面積之比值，即為布氏硬度值（HB）。洛氏硬度（HR）當HB45或者試樣過小時，不能采用布氏硬度試驗而改用洛氏硬度計量。它是用一個頂角12°的金剛石圓錐體或直徑為1.53.18mm的鋼球，在一定載荷下壓入被測材料表面，由壓痕的深度求出材料的硬度。
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燃氣壓力開關，DG40VC1-5WG/B，75454579
燃氣壓力開關，DG17VC1-6W/B，75455241
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SO2進入大氣后，若大氣干燥清潔，可停留～2星期。經高煙囪排放后，在.5km高空風的影響下，24h之后會有5%以上超越7km之外，6h后，能擴散到km之外�？茖W家曾估計過，我國大部分省份排放的SO2，有一半以干濕沉降方式沉降在本省范圍，有2～3%沉降到周圍省份，其它則沉降到較遠的省份。大城市則更為突出，它們排放的SO2，僅2%左右沉降在本市內，8%則被傳輸到其它地方去了。高煙囪排放含硫煙氣大大減輕了燃煤發電廠周邊地區的大氣SO2落地濃度，較為有效地改善了燃煤發電廠周邊地區的大氣環境質量。
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