【单选题】两个电阻串联,已知 R1=2R2,U1=4V,则U2为( )
【多选题】关于目视进近下列说法不正确的是:
C.
目视进近必须由飞行员首先提出申请管制员批准方可实施。
【简答题】Answer question 5 What does "demonstration effect" mean here? What is the result of it?
【简答题】若两个电阻串联,已知R 1 =3R 2 ,则U 1 = _____U 2
【单选题】两个电阻R1和R2串联,已知R1=2R2,则电阻上的电压比U1:U2等于( )
【判断题】2011年,我国首台胶囊内镜和国际首台遥控胶囊胃镜机器人研制成功。()
【单选题】What does layoff result in?
A.
The workers who always change jobs don't feel secure.
B.
The workers are under mental pressure.
C.
It can damage the structure of the society.
【简答题】两个电阻串联,其中R1=20Ω,R2=100Ω。已知R1两端的电压U1=40V,R2两端的电压U2= V,整个串联电路的总电压U= V。