【单选题】关于电压源与电流源的等效变换,下面说法错误的是()
A.
电源等效变换的要求是变换的前后它们具有相同的外特性。
C.
任何一个理想电压源和某电阻而串联的电路,都可以等效变为一个理想电流源和一个电阻相并联的电路。
【判断题】作用尺寸和关联作用尺寸都是随实际要素的状态不同而改变的。
【单选题】Which of the following statements is INCORRECT?
A.
Computertowns in the UK have become popular.
B.
Computertowns and clubs cater for different people.
C.
Computertowns are more successful than clubs.
D.
It's better that Computertowns and clubs work together.
【单选题】Which of the following is NOT tree?
A.
The prices of many things have gone up in the last month.
B.
The woman pays twenty dollars for the ticket.
C.
The prices of the ticket have changed by two dollars.
【单选题】下面关于实际电压源与实际电流源叙述正确的是( )。
【判断题】电工应严格按照操作规程进行作业。A. 对 B. 错
【单选题】关于电源的等效变换,下列说法正确的是( )
D.
变换过程中只需考虑大小关系,方向关系不必考虑