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【单选题】
「」是香港一家驰名的传统粤式糕点零食店，始创于1927年。她以传统方式经营，没有在经营上作出革新。她在香港的上环和太子各有一家分店，并无其他销售渠道。这种模式是A.
完全电子商务
B.
传统零售商模式
C.
增值的网络模式
D.
鼠标加水泥零售模式
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反馈参考答案：
举一反三
【简答题】The generator was doused, and the light went out.
【单选题】A DC generator is used to supply direct current in order to maintain an AC generator field and is known as a/an _____.
A.
rotor
B.
stator
C.
exciter
D.
armature
【单选题】A diesel generator has just been paralleled with an AC turbo-generator, but the load can not be properly divided .This could be caused by____________
A.
an incorrect diesel generator governor speed droop adjustment
B.
a faulty reverse power relay within the main circuit breaker assembly
C.
unsynchronized isochronous load distribution adjustments
D.
a different speed setting on each unit
【单选题】Loss of or weak residual magnetism in an alternator or generator can be corrected for by ______.
A.
running the rotor in the opposite direction for 5 minutes
B.
allowing the generator to run at 10% of normal speed for 5 minutes
C.
running the generator at normal speed with the field rheostat fully counterclockwise
D.
using a storage battery or battery charger to 'flash' the field
【单选题】When securing an AC generator, you should FIRST _____.
A.
open the generator circuit breaker
B.
switch the voltage regulator to 'manual'
C.
decrease the field excitation to minimum
D.
reduce the load on the unit
【单选题】The purpose of DC generator brushes is to （）.
A.
neutralize armature reaction
B.
conduct electric current to an outside circuit
C.
convert DC current to AC current
D.
provide excitation to a DC generator
【单选题】When the generator overloads in an automatic electric power plant, ______.
A.
the stand-by generator set will start and synchronize automatically
B.
the ACB of generator will trip
C.
the windings of generator will burn out
D.
the whole ship will lose power
【单选题】Which of the following is true of an asynchronous generator?
A.
The generator uses brushes and slip rings
B.
The rotation and driving frequency are the same
C.
Permanent magnets are used
D.
There is no electrical connection to the rotor
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