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DONGYANG F&C 氫氧化鈉自動閥
BDD-1000S BDD-1100S BDD-1200S BDD-1300S BDD-1400S BDD-1500S
BDD-2000S BDD-2100S BDD-2200S BDD-2300S BDD-2400S BDD-2500S
BDD-3000S BDD-3100S BDD-3200S BDD-3300S BDD-3400S BDD-3500S
BDD-1010S BDD-1110S BDD-1210S BDD-1310S BDD-1410S BDD-1510S
BDD-2010S BDD-2110S BDD-2210S BDD-2310S BDD-2410S BDD-2510S
BDD-3010S BDD-3110S BDD-3210S BDD-3310S BDD-3410S BDD-3510S

　　磁場是對放入其中的磁體有磁力的作用的物質(zhì)叫做磁場，磁場的基本特征是能對其中的運動電荷施加作，即通電導(dǎo)體在磁場中受到...磁場的定義磁場是一種看不見、摸不著的特殊物質(zhì)，磁場不是由原子或分子組成的，但磁場是客觀存在的。

BDD-1020S BDD-1120S BDD-1220S BDD-1320S BDD-1420S BDD-1520S
BDD-2020S BDD-2120S BDD-2220S BDD-2320S BDD-2420S BDD-2520S
BDD-3020S BDD-3120S BDD-3220S BDD-3320S BDD-3420S BDD-3520S
BDD-1001S BDD-1101S BDD-1201S BDD-1301S BDD-1401S BDD-1501S
BDD-2001S BDD-2101S BDD-2201S BDD-2301S BDD-2401S BDD-2501S
BDD-3001S BDD-3101S BDD-3201S BDD-3301S BDD-3401S BDD-3501S
BDD-1011S BDD-1111S BDD-1211S BDD-1311S BDD-1411S BDD-1511S
BDD-2011S BDD-2111S BDD-2211S BDD-2311S BDD-2411S BDD-2511S

　　改裝大小所需電阻阻值有個公式：R1=R/[（I1/I）-1]，其中R1是改裝時所需的電阻阻值，R是靈敏電流計的線圈阻值，I1是改裝后電流表最大量程，I是靈敏電流計最大量程。學(xué)生用電流表有兩個量程，也就是有兩個電阻；指針式萬用表上的量程選擇實際是電位器�！　� 也可以根據(jù)刀片的顏色變色，甚至有發(fā)紅，火花等現(xiàn)象來確定，方法主要有以下這些:一刀閘觸頭過熱的處理1,用示溫片復(fù)測或用紅外線測溫儀測量，觸頭實際溫度若超過規(guī)定值(70℃)時應(yīng)查明原因及時處理，2,外表檢查導(dǎo)電部分若不良。

BDD-3011S BDD-3110S BDD-3211S BDD-3311S BDD-3411S BDD-3511S
BDD-1021S BDD-1121S BDD-1221S BDD-1321S BDD-1421S BDD-1521S
BDD-2021S BDD-2121S BDD-2221S BDD-2321S BDD-2421S BDD-2521S
BDD-3021S BDD-3121S BDD-3221S BDD-3321S BDD-3421S BDD-3521S
BDD-1002S BDD-1102S BDD-1202S BDD-1302S BDD-1402S BDD-1502S
BDD-2002S BDD-2102S BDD-2202S BDD-2302S BDD-2402S BDD-2502S
BDD-3002S BDD-3102S BDD-3202S BDD-3302S BDD-3402S BDD-3502S
BDD-1012S BDD-1112S BDD-1212S BDD-1312S BDD-1412S BDD-1512S
BDD-2012S BDD-2112S BDD-2212S BDD-2312S BDD-2412S BDD-2512S

　　人工照明破壞了幽美的夜空，改變了自然生態(tài)環(huán)境。是隨著城市夜景照明的迅速發(fā)展，大功率高強度氣體放電燈在建筑夜景照明和道路照明中的廣泛采用，光污染越來越嚴重。再加上商業(yè)街的霓虹燈、燈箱廣告和燈光標志等越來越多、規(guī)模也越來越大，亮度越來越高，道路發(fā)展和過度照明加速了光污染的發(fā)展�！　�2．熱繼電器額定電流的選擇：1）保證電動機正常運行及起動：在正常起動的起動電流和起動時間、非起動的，必須保證電動機的起動不致使熱繼電器誤動。當(dāng)電動機起動電流為額定電流的6倍、起動時間不超過6s、很少連續(xù)起動的條件下，一般可按電動機的額定電流來選擇熱繼電器。

BDD-3012S BDD-3110S BDD-3212S BDD-3312S BDD-3412S BDD-3512S
BDD-1022S BDD-1122S BDD-1222S BDD-1322S BDD-1422S BDD-1522S
BDD-2022S BDD-2122S BDD-2222S BDD-2322S BDD-2422S BDD-2522S
BDD-3022S BDD-3122S BDD-3222S BDD-3322S BDD-3422S BDD-3522S
BDD-1003S BDD-1103S BDD-1203S BDD-1303S BDD-1403S BDD-1503S
BDD-2003S BDD-2103S BDD-2203S BDD-2303S BDD-2403S BDD-2503S
BDD-3003S BDD-3103S BDD-3203S BDD-3303S BDD-3403S BDD-3503S
BDD-1013S BDD-1113S BDD-1213S BDD-1313S BDD-1413S BDD-1513S
BDD-2013S BDD-2113S BDD-2213S BDD-2313S BDD-2413S BDD-2513S
BDD-3013S BDD-3110S BDD-3213S BDD-3313S BDD-3413S BDD-3513S
BDD-1023S BDD-1123S BDD-1223S BDD-1323S BDD-1423S BDD-1523S

　　f:電網(wǎng)，工頻電為50HZ。p：電機極對數(shù)，如：2極電機，對數(shù)是1；4極電機，對數(shù)是2；當(dāng)然這是同步轉(zhuǎn)速，對于平時遇到的異步電機，電機轉(zhuǎn)子轉(zhuǎn)速低于定子磁場轉(zhuǎn)速，所以還涉及到電機轉(zhuǎn)差率的因素。但從公式中可看出，和電機級數(shù)有關(guān)�！　《l(fā)電機、電動機等一、二次繞組中都有“減效應(yīng)”的問題，如電流互感器的“減極性”、發(fā)電機電樞（定子）繞組的“去（削）磁”反應(yīng)、發(fā)電機定子和轉(zhuǎn)子的“同步”、發(fā)電機的進相問題等等，熟悉電氣設(shè)備“減”（或削弱）的感念，對于更深入的熟悉和了解設(shè)備，很重要。

BDD-2023S BDD-2123S BDD-2223S BDD-2323S BDD-2423S BDD-2523S
BDD-3023S BDD-3123S BDD-3223S BDD-3323S BDD-3423S BDD-3523S
BDD-1004S BDD-1104S BDD-1204S BDD-1304S BDD-1404S BDD-1504S
BDD-2004S BDD-2104S BDD-2204S BDD-2304S BDD-2404S BDD-2504S
BDD-3004S BDD-3104S BDD-3204S BDD-3304S BDD-3404S BDD-3504S
BDD-1014S BDD-1114S BDD-1214S BDD-1314S BDD-1414S BDD-1514S
BDD-2014S BDD-2114S BDD-2214S BDD-2314S BDD-2414S BDD-2514S
BDD-3014S BDD-3110S BDD-3214S BDD-3314S BDD-3414S BDD-3514S
BDD-1024S BDD-1124S BDD-1224S BDD-1324S BDD-1424S BDD-1524S
BDD-2024S BDD-2124S BDD-2224S BDD-2324S BDD-2424S BDD-2524S
BDD-3024S BDD-3124S BDD-3224S BDD-3324S BDD-3424S BDD-3524S

 　　1923年1月，Siemens Halske的Schottky和Gerlach申請了第一個帶式揚聲器專利。它將一個水平波浪型純鋁簿膜安裝在磁體兩極之間，波浪形純鋁膜可以降低縱向硬度，降低了諧振頻率。1931年，Olson 和Massa 生產(chǎn)了帶式麥克風(fēng)�！　〖彝ス╇娨话愠霈F(xiàn)斷路器跳閘，要判斷是電器、線路短路、漏電，還是開關(guān)本身絕緣老化造成的誤動作，的辦法是用斷開法，縮小故障范圍，找到故障點，也可以有電流表檢測用電器工作電流，判斷斷路器的標稱值是否還能達標。