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【简答题】
存在于椎体间的连结装置有____、____和____;
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【简答题】简述种子商品的特点。
【单选题】The excitation resistance of the transformer is an equivalent resistance reflecting ( ).
A.
total loss
B.
short-circuit loss
C.
iron loss
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.
【单选题】A transformer is a device that can converter one ac voltage to another ac voltage through the action of () .
A.
an electric circuit
B.
a magnetic field
C.
an electric field
D.
a coupling circuit
【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...
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