【判断题】【消耗次数：1】
变压器铭牌上标有额定电压U1N、U2N，其中U2N表示原边接额定电压，副边满载时的副边电压。
①
正确
②
错误
参考答案：
复制
纠错
相关题目
【单选题】
在单相桥式整流电路中，输出电压的平均值UO与变压器副边电压有效值U2应满足______关系。
①
U0=0、9U2
②
U0=1、0U2
③
U0=1、4U2
④
U0=1、2U2
随机题目
【单选题】
If we hadn’t got a lift, we ____ the top flat so soon.
①
would not reach
②
can not reach
③
could not have reached
④
will not reach
【单选题】
With the old man____ the way, we had no trouble in finding that mysterious cave.
①
lead
②
to be led
③
leading
④
led
【单选题】
The computer of this kind is ____ handling with all kinds of information.
①
capable to
②
able to
③
capable of
④
able of
【单选题】
People ____ to the speech in different ways: some got angry while others nodded in agreement.
①
responded
②
acted
③
answered
④
replied
【单选题】
23. Anna was reading a piece of science fiction, completely ____ to the outside world.
①
being
②
having lost
③
losing
④
lost
【单选题】
Mike is always losing something. He is a ____boy.
①
careful
②
hopeful
③
careless
④
hopeless
【单选题】
Dont be too ____ about things youre not supposed to know.
①
strange
②
amusing
③
curious
④
conscious
【单选题】
You can take as many as you like because these handouts are free of ____.
①
fare
②
charge
③
money
④
pay
【单选题】
22. One day while Mr. King was working, he had a/an ____: his left leg was badly injured.
①
business
②
accident
③
matter
④
event
【单选题】
This is the military ____, and nobody is allowed to get in without permission. ?
①
bond ?
②
B. zone ?
③
uniform ?
④
zoo ?