【多选题】关于自耦变压器描述正确的是:
D.
为保证安全,自耦变压器使用时必须找准零线和火线
【单选题】自耦变压器的最大优点是输出电压可以调节,但是它不能作( )变压器。
【单选题】—Sorry,what did you say just now? --I asked .
D.
how I could get to the station
【简答题】AD 转换需进过 , , , 四个步骤。
【单选题】Did you say ___ ?
A.
that what he said was true
B.
what did he say was true
C.
that it was true that he said
D.
what he said it was true
【单选题】自耦变压器输出的“低”压是()作为安全电压。
【判断题】220 / 20V 的单相自耦变压器,因其输出电压低,故可以触摸其输出端点。 ( )