【单选题】The excitation resistance of the transformer is an equivalent resistance reflecting ( ).
D.
secondary winding loss
【简答题】What is genetic susceptibility ?
【单选题】What is NOT tree about genes in the process of genetic modification?
A.
Genes interact with one another.
B.
Normal genes may be damaged in the process.
C.
The transferred gene may have different functions in different organisms.
D.
The transferred trait controlled by one gene can be transferred endlessly.
【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 () .
【单选题】What does the sentence “The genetic genie is out of the bottle” mean? ______
A.
The genetic genie is out of the bottle that confines it.
B.
Genetically modified foods are already very much a part of our lives.
C.
The genetic genie brings a lot of damage to human beings.
D.
There are clearly some very real issues about genetically modified foods that need to be resolved.
【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...
【判断题】人体内嘌呤核苷酸分解代谢的最终产物是尿酸,与其生成有关的重要酶是黄嘌呤氧化酶。()