问题
单项选择题
现有A、B两台单相变压器，均为，两变压器原、副边绕组匝数分别相等，假定磁路均不饱和，如果两台变压器原边分别接到220V电源电压，测得空载电流。今将两台变压器的原边顺极性串联后接到440V的电源上，则B变压器原边的空载电压应为（）V。
A.73.3
B.146.67
C.293.33
D.110
答案
参考答案：C
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现有A、B两台单相变压器，均为，两变压器原、副边绕组匝数分别相等，假定磁路均不饱和，如果两台变压器原边分别接到220V电源电压，测得空载电流。今将两台变压器的原边顺极性串联后接到440V的电源上，则B变压器原边的空载电压应为（）V。
A.73.3
B.146.67
C.293.33
D.110
参考答案：C
What does the speaker mean a. It is not very possible that this news may change the mind of David. b. It is not very possible that this news may cause much attention of David. c. It is not very possible that this news may be welcomed by David. d. It is not very possible that this news may do any good to David.