【单选题】The is nothing more that an electrical transformer.
【简答题】A transformer(变压器) is a device based upon this effect which is used to change the voltage(电压) in an ac circuit(交流电路) from one value to another.
【单选题】预期股价上涨而买入股票,结果股价却下跌,又不甘心将股票卖出,被动等待获利时机的出现。这种情况情况称为
【单选题】Based on the principle of electromagnetic induction, the fundamental method to realize voltage transformation in a transformer is that ( ).
A.
the number of turns of the primary and secondary winding is the same
B.
the number of turns of the primary and secondary winding is different
C.
there is an electrical connection between the primary and secondary winding
D.
the primary and secondary windings are insulated from each other
【判断题】套牢是指预期股价上涨而买入股票,结果股价却下跌,又不甘心将股票卖出,被动等待获利时机的出现。
【单选题】A transformer is a device that can converter one ac voltage to another ac voltage through the action of () .
【简答题】A
15-kVA 7000/230-V distribution
transformer has an impedance referred to the primary of 80 + j300Ω. The
components of the excitation branch referred to the primary side are Rc = 350 kΩ and Xm = 70 kΩ...
【单选题】预期股价上涨而买入股票,结果股价却下跌,又不甘心将股票卖出,被动等待获利时机的出现。以上过程在股票交易中属于 ( ) 。