【单选题】在电动势为3V的电路中,用3个相同电阻组成先并联后串联电路,要想得到2A的总电流强度,单个电阻的阻值应为()Ω。
【单选题】What is the main idea of the text?
A.
Recycling of electronic items is a 'success story'.
B.
Environmentalists are opposed to recycling electronics.
C.
Recycling can not keep pace with electronics sales.
D.
It is unnecessary to recycle electronics.
【单选题】What is the main theme of the passage?
A.
Having a goal is vital to success.
B.
Being good is different from being great.
C.
One cannot succeed without time and practice.
D.
Luck,talent and family help to achieve success.
【单选题】Which of the following statements best describes the main idea of Success for Teens ?
A.
Good habits somewhat help but don’t promise success.
B.
Bad habits constantly hold teens back.
C.
Possibly it takes longer to develop a good habit than to get rid of a bad one.
D.
Certain useful tips that teens can implement will help them develop good habits.
【判断题】变压器等效电路的串联和并联表示的激磁回路中,激磁电阻和铁耗电阻值相同。
【单选题】在电动势为3V的电路中,用3个相同电阻组成先并联后串联电路,在不计内阻的情况下,要想得到2A的总电流强度,单个电阻的阻值应为()。
【单选题】在由三个相同阻值的电阻组成的先串联后并联的电路中,串联支路的电流比另一个支路的电流()。
【简答题】One of my main concerns when I am helping people achieve their goals is how they measure success. I see individuals getting frustrated as they struggle hard for success. One of the main reasons that c...