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【判断题】
天棚面层在同一标高者为平面天棚,不在同一标高者为阶梯式(跌级式)天棚,同一工程如天棚应分别列项计算。A.
正确
B.
错误
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举一反三
【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。
B.
变换前后，它们具有相同的内特性。
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。
D.
理想电压源和理想电流源之间不能等效变换。
【单选题】Which of the following is NOT true?
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】Which of the following statements is true?
A.
Most women in England have become doctors and lawyers．
B.
Women are no longer forced to be a supportive role in the society．
C.
The typewriter was invented specially for women．
D.
only“nice ladies”Went out of the home and into the business world．
【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( )。
A.
电压源与电流源不能等效变换。
B.
电压源与电流源变换前后对内电路不等效
C.
电压源与电流源变换前后对外电路不等效。
D.
以上三种说法都不正确。
【单选题】关于电源的等效变换，下列说法正确的是（ ）
A.
电压源与电流源不能进行等效变换
B.
电压源与电流源等效变换前后对内电路也等效
C.
电压源与电流源等效变换前后对内电路不等效
D.
变换过程中只需考虑大小关系，方向关系不必考虑
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