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【简答题】
语言接触引起语言演变,包括语言结构的变化和语言( )的变化。
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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 generator (alternator) could test as producing lower-than normal output, yet be okay, if _____.
A.
The battery is weak or defective
B.
The engine speed is not high enough during testing
C.
The drive belt is loose or slipping
D.
All of the above occur
【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
【多选题】关于日前交易正确的说法()
A.
我国日前交易通常采用一部分投标方式
B.
交易中心将首先安排机组的合同电量
C.
得到机组和电网可行的发电计划是日前交易的最终结果
D.
B.交易中心将首先安排机组的合同电量C.得到机组和电网可行的发电计划是日前交易的最终结果我国日前交易通常采用多次投标方式
【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
【简答题】填空题: 1. 现存契丹人创世纪传说三种版本是()、()、()。 2. 契丹名称首次出现在二十四史中的(),时间是()年。 3. 契丹人真正的独立发张是从()年开始的。 4. 张柏忠提出的()考古学文化揭示了契丹与鲜卑的渊源。 5. 从公元()年开始开始着手军制改革,广募关陇豪右,以增军旅,到公元()年,完成()的建设。 6. 宇文鲜卑在历史上又被称为()或()。 7. 阴山七骑图是五代...
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