【简答题】对于晶闸管的三个电极,可以用万用表粗测其好坏。依据PN结单向导电原理,用万用表欧姆挡测试元件的三个电极之间的阻值,可初步判断管子是否完好。用万用表R×1 kΩ 挡测量晶闸管阳极A和阴极K之间的正向电阻 ,反向电阻 。
【单选题】指定代理是根据( )和有关主管机关指定。
【简答题】B Every year from March to October, Christian Moullec, also known as “Birdman,” takes to the skies aboard his adapted light aircraft. However, the 58-year-old Frenchman’s daily 30-minute flight is not...
【单选题】壮壮为了别人手中的玩具而打他人,壮壮行为属于( )
【多选题】对于那些我所照顾的人,我总是放心不下,因为我会担心会有什么意外发生在他身上。