【简答题】在如图所示各电路中,已知稳压管D 1 的稳压值为6V,D 2 的稳压直为10v。试分别计算各电路的输出电压U o 。稳压管正向压降以0.7V计算。
【单选题】在图1-15所示电路中,变压器次级电压u2的有效值为10V,电路的输出电压Uo为( )。
【单选题】What does the 'exasperated Krauss' mean when he talks about the adience?
A.
He disagrees there should be a representative debate.
B.
He stresses that what these people require is reasonable.
C.
He insists that different opinions should be presented in school.
D.
He rejects the idea that we should teach whatever is presented.
【单选题】形状复杂零件的毛坯,尤其是具有复杂内腔时,最适合采用()生产。
【简答题】体外培养的胚胎干细胞在无分化抑制剂的条件下,可自发分化形成 ,将一定量的胚胎干细胞注射入同源动物皮下,可形成 ,将其与受体胚胎结合,并移植入母体,最终可得到 。
【简答题】连词组句。 1. talks, he, the, on, phone ___________________. 2. watches, TV, he, in, the, evening __________________________. 3. he, on, the computer, plays, in, the, afternoon ____________________________...
【单选题】在图1-14所示电路中,当变压器次级电压吃的有效值为10V,电路的输出电压Uo为( )。