高清久久无码,超碰免费自慰,亚洲国产白丝,探花丨丝袜丨精品导航综合

原標題：chinese最新男18guy

學習快評丨qibao666888　　此??(ci)外?(wai)??，潮?(chao)濕??(shi)天??(tian)氣??(qi)下??(xia)??，隨??(sui)風??(feng)飄?(piao)動??(dong)的??(de)風??(feng)箏??(zheng)??，一?(yi)旦??(dan)靠?(kao)近??(jin)或祝(huo)者??(zhe)接??(jie)觸??(chu)到??(dao)高??(gao)壓??(ya)線??(xian)路??(lu)??，不??(bu)僅??(jin)容??(rong)易?(yi)造??(zao)成?(cheng)人??(ren)身??(shen)傷??(shang)害??(hai)??，還??(hai)極??(ji)易??(yi)引??(yin)發??(fa)線??(xian)路??(lu)短??(duan)路??(lu)、跳??(tiao)閘??(zha)等?(deng)安??(an)全??(quan)事??(shi)故??(gu)??。??　　羅??(luo)塘??(tang)高??(gao)級??(ji)中??(zhong)學??(xue) 劉??(liu)老??(lao)師??(shi)：我??(wo)們?(men)現??(xian)在??(zai)所??(suo)用??(yong)到?(dao)的??(de)器??(qi)材??(cai)是??(shi)一??(yi)節??(jie)干??(gan)電??(dian)池??(chi)、一??(yi)個??(ge)開??(kai)關??(guan)、一??(yi)個??(ge)滑??(hua)動??(dong)變??(bian)阻??(zu)器??(qi)和??(he)一?(yi)個??(ge)電??(dian)流??(liu)表??(biao)??。??現??(xian)在??(zai)在??(zai)這??(zhe)個??(ge)電??(dian)路??(lu)里??(li)接??(jie)了?(le)一??(yi)個??(ge)干??(gan)燥?(zao)的??(de)風??(feng)箏??(zheng)線??(xian)??，接?(jie)下?(xia)來??(lai)將??(jiang)開??(kai)關??(guan)閉??(bi)合??(he)??，可?(ke)以??(yi)看??(kan)到??(dao)電??(dian)流??(liu)表??(biao)的??(de)示??(shi)數??(shu)仍??(reng)然??(ran)為??(wei)0??。說??(shuo)明??(ming)在??(zai)干??(gan)燥??(zao)環??(huan)境??(jing)下??(xia)??，風??(feng)箏??(zheng)線??(xian)是??(shi)不??(bu)導??(dao)電??(dian)的?(de)??。接??(jie)下??(xia)來??(lai)將??(jiang)開??(kai)關??(guan)斷??(duan)開??(kai)??，取??(qu)下??(xia)干??(gan)燥??(zao)的??(de)風??(feng)箏??(zheng)線??(xian)??，將??(jiang)這??(zhe)根??(gen)風??(feng)箏??(zheng)線??(xian)泡??(pao)入??(ru)含??(han)有??(you)雜??(za)質??(zhi)的??(de)水??(shui)中??(zhong)??，再??(zai)將??(jiang)它??(ta)取??(qu)出??(chu)??。然??(ran)后??(hou)將??(jiang)浸??(jin)滿??(man)水??(shui)的??(de)風?(feng)箏??(zheng)線??(xian)接??(jie)入??(ru)電??(dian)路??(lu)??，閉??(bi)合?(he)開??(kai)關??(guan)??，可??(ke)以??(yi)發??(fa)現??(xian)電??(dian)流??(liu)表??(biao)的??(de)指?(zhi)針??(zhen)有??(you)了??(le)明??(ming)顯??(xian)偏??(pian)轉??(zhuan)??。。