山東中發(fā)ELTRA EH80P1024Z8/24L14x3HR 編碼器廠家報(bào)價(jià)
常用的空氣開關(guān)有1P、2P、3P、4P這四種，根據(jù)供電方式選擇適用的就行。1P就是所說(shuō)的單線，其實(shí)是指單相，只能保護(hù)一根火線，適用于照明或小功率的220V電器;2P用于一火一零的接線，一般用220V的電動(dòng)機(jī)之類;3P用于三根火線的接線，也就是380V的接線，一般用于380V的電器;4P用于三火一零的接線，通常是用于帶零線的380V電器，當(dāng)然也能做總開關(guān);1P空氣開關(guān)又稱單極空氣開關(guān)，它只有一個(gè)進(jìn)口和一個(gè)出口，所以只要接火線。
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TEAFLEX PRM32MC PRES.MULTIF. 8X4-1X4S ISO32
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山東中發(fā)ELTRA EH80P1024Z8/24L14x3HR 編碼器廠家報(bào)價(jià)
學(xué)習(xí)目標(biāo)的概念就是：“學(xué)習(xí)中學(xué)習(xí)者預(yù)期達(dá)到的學(xué)習(xí)結(jié)果和標(biāo)準(zhǔn)”。俄國(guó)偉大作家托爾斯泰說(shuō)：“要有生活目標(biāo)，一個(gè)月的目標(biāo)，一個(gè)星期的目標(biāo)，的目標(biāo)，一個(gè)小時(shí)的目標(biāo)，一分鐘的目標(biāo)，還得為大目標(biāo)犧牲小目標(biāo).”學(xué)習(xí)目標(biāo)具有導(dǎo)向、啟動(dòng)、激勵(lì)、凝聚、調(diào)控、制約等心理作用.有了明確的學(xué)習(xí)目標(biāo)，就會(huì)朝著目標(biāo)自覺地、努力地學(xué)習(xí)，會(huì)對(duì)學(xué)習(xí)產(chǎn)生更積極的影響。完成同樣的學(xué)習(xí)任務(wù)，如果學(xué)習(xí)者學(xué)習(xí)目標(biāo)明確，會(huì)比沒有目標(biāo)可以節(jié)省60%以上的時(shí)間.有人打過(guò)形象的比喻沒有明確目標(biāo)的學(xué)習(xí)像是飯后散步；有明確目標(biāo)的學(xué)習(xí)就像是運(yùn)動(dòng)會(huì)上的賽跑。
