【单选题】In a modern three-phase A.Csynchronous brushless generator, the excitation winding is on the rotorThat means _____. A.The generator needs not excitation
B.
The winding on the rotor is for inputting excitation current
【单选题】The science of wildlife management is actually quite new. It is the third major phase of the original conservation movement. The first phase involved the preservation of wildlife through laws and hunt...
A.
the history of the wildlife conservation movement
B.
the preservation of wildlife through laws
C.
wildlife management as a new approach
D.
protection and improvement of the habitat of animals