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否則，當(dāng)故障發(fā)生絲熔斷時(shí)會(huì)出現(xiàn)飛弧、引燃、絲燒毀、連同件一起熔融、絲標(biāo)記無(wú)法辨認(rèn)等現(xiàn)象。當(dāng)然，劣質(zhì)絲的分?jǐn)嗄芰�達(dá)不到規(guī)定的要求，使用時(shí)同樣會(huì)發(fā)生上述的危害。[2]分類(lèi)按保護(hù)形式分，可分為：過(guò)電流保護(hù)與過(guò)熱保護(hù)。用于過(guò)電流保護(hù)的絲就是平常說(shuō)的絲（也叫限流絲）。用于過(guò)熱保護(hù)的絲一般被稱(chēng)為"溫度絲"。溫度絲又分為低熔點(diǎn)合金形與感溫觸發(fā)形還有記憶合金形等等（溫度絲是防止電器或易電器溫度過(guò)高而進(jìn)行保護(hù)的，例如：電吹風(fēng)、電熨斗、電飯鍋、電爐、變壓器、電動(dòng)機(jī)等等；它響應(yīng)于用電電器溫升的升高，不會(huì)理會(huì)電路的工作電流大小。其工作原理不同于"限流絲"）。按使用范圍分，可分為：電力絲、機(jī)床絲、電器儀表絲（電子絲）、汽車(chē)絲。

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總之，只有了解用戶(hù)、了解任務(wù)才能設(shè)計(jì)出好的人機(jī)界面。確定為完成此功能人和計(jì)算機(jī)應(yīng)分別完成的任務(wù)任務(wù)分析有兩種途徑。一種是從實(shí)際出發(fā)，通過(guò)對(duì)原有處于手工或半手工狀態(tài)下的應(yīng)用的剖析，將其映射為在人機(jī)界面上執(zhí)行的一組類(lèi)似的任務(wù)；另一種是通過(guò)研究的需求規(guī)格說(shuō)明，導(dǎo)出一組與用戶(hù)模型和假想相協(xié)調(diào)的用戶(hù)任務(wù)。逐步求精和面向?qū)ο蠓治龅燃夹g(shù)同樣適用于任務(wù)分析。逐步求精技術(shù)可把任務(wù)不斷劃分為子任務(wù)，直至對(duì)每個(gè)任務(wù)的要求都十分清楚；而采用面向?qū)ο蠓治黾夹g(shù)可識(shí)別出與應(yīng)用有關(guān)的所有客觀的對(duì)象以及與對(duì)象關(guān)聯(lián)的。考慮界面設(shè)計(jì)中的典型問(wèn)題設(shè)計(jì)任何一個(gè)機(jī)界面，一般必須考慮響應(yīng)時(shí)間、用戶(hù)求助機(jī)制、錯(cuò)誤信息處理和命令四個(gè)方面。如用鐵皮制作防護(hù)罩，應(yīng)在觀察水位的方向前、后兩個(gè)罩壁上都要開(kāi)有寬12~15mm的縫隙，其長(zhǎng)度應(yīng)比玻璃管長(zhǎng)度大一些。后面留縫隙是為了使光線射入，便于觀察。切忌用普通玻璃做防護(hù)罩，以防玻璃管破裂后，反而危險(xiǎn)。雙面玻璃板水位計(jì)雙面玻璃板水位計(jì)主要由汽閥門(mén)、水閥門(mén)，壓板、玻璃板、排污閥，排污管和法蘭等構(gòu)成。它的特點(diǎn)是用平面的玻璃板取代了玻璃管，玻璃板的內(nèi)表面通常開(kāi)有三棱形的溝槽，利用光線在溝槽內(nèi)的折射作用，使汽水分界線非常明顯。由于汽、水的折射率不同，汽和水會(huì)呈現(xiàn)出不同的顏色，蒸汽呈亮白色，水則顯得灰暗，二者的界線十分明顯，便于觀察。當(dāng)鍋爐工作壓力較高時(shí)，可在玻璃板后面嵌襯云母片，以運(yùn)行性。