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【单选题】
制定某物质卫生标准的科学依据是（）。
A.
中毒剂量
B.
最大无作用剂量或阈剂量
C.
耐受剂量
D.
吸入剂量
E.
吸收剂量
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【简答题】The generator was doused, and the light went out.
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案
【判断题】软胶囊的制备方法有滴制法和压制法
A.
正确
B.
错误
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案
相关题目：
【简答题】The generator was doused, and the light went out.
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案
【判断题】软胶囊的制备方法有滴制法和压制法
A.
正确
B.
错误
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案