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【单选题】
造成流感大流行的主要原因是A.
抗原变异
B.
低温潮湿
C.
居住拥挤
D.
在自然灾害等条件下，居民的生活条件恶化
E.
人口流动
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举一反三
【单选题】The is nothing more that an electrical transformer.
A.
ignition plug
B.
ignition coil
C.
ignition switch
D.
distributor
【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】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
【单选题】External to the distributor is the ________, which is nothing more than an electrical transformer.
A.
ignition coil
B.
distributor cap
C.
breaker points
D.
spark plug wires
【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
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