【单选题】Rescue Platform In the aftermath of the terrorist attacks on the World Trade Center, security experts are trying to develop new ways of rescuing people from buming skysrapers. One idea is a platform. ...
【单选题】The writer sees education as______.
A.
a means of providing job security and financial security and a means of meeting a country's demands for technical workers
B.
a way to broaden one's horizons
C.
more important than finding a job
D.
an opportunity that everyone should have
【简答题】变压器的主要额定值有哪些 ? 一台单相变压器的额定电压为 220V / 110V ,额定频率为 50Hz ,试说明其意义。若这台变压器的额定电流为 4.55A / 9.1A ,问在什么情况下称其运行在额定状态 ?
【单选题】一台单相变压器的额定电压为 ,额定容量为 ,满载时次级端电压为 ,则额定电流 和 分别为( )。
【单选题】VB中,若没有显式声明变量的数据类型,则默认的类型是
【简答题】图像资源中如果存在一个图片资源pic,则在布局文件中引用该图片资源时的格式是@_____。
【单选题】一台单相变压器的额定电压为U 1N /U 2N =10/0.4kV,额定电流为I 1N /I 2N =25/625A,则变压器的额定容量S N 为()kVA。
【单选题】一台单相变压器的额定容量 ,额定电压为 ,满载时,次级端电压为 ,则其额定电流 和 分别为( )。