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◆執(zhí)行元件接觸器、繼電器觸點(diǎn)是否粘連或燒壞/可控硅、繼電
◆器是否擊穿                                                                        
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◆執(zhí)行元件加熱管、加熱絲是否對(duì)地                                                                         
◆維修/更換                                                                                                                                        
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