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【单选题】
某火力发电厂,在海拔1000m以下,发电机变压器组单元接线如图所示。设i1、i2分别为d1、d2点短路时流过DL的短路电流,已知远景最大运行方式下,i1的交流分量起始有效值为36kA不衰减,直流分量衰减时间常数为45ms;i2的交流分量起始有效值为3.86kA,衰减时间常数为720ms,直流分量衰减时间常数为260ms。请解答下列各题(计算题按最接近数值选项)。试计算接地开关GD应满足的最小动稳定电流最接近下列哪项数值()?
A.
120kA
B.
107kA
C.
104kA
D.
94kA
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参考答案:
举一反三
【判断题】在背景层上可以使用图层的样式进行特殊效果的制作。
A.
正确
B.
错误
【单选题】The two things __________ they felt very proud are Jim’s gold watch and Della’shair.
A.
about which
B.
of which
C.
in which
D.
for which
【单选题】Task 2 Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45. Thomas Alva Edison lit up the world with his invention of the electric light. W...
A.
24
B.
8
C.
12
D.
16
【单选题】甲当众诽谤、辱骂丙。丙经受不了刺激,自杀身亡。甲之行为侵害丙的( )
A.
.荣誉权
B.
名誉权
C.
生命权
D.
健康权
【单选题】The two things __________ they felt very proud are Jim’s gold watch and Della’s hair.
A.
about which
B.
of which
C.
in which
D.
for which
【单选题】Task 2 Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45. Thomas Alva Edison lit up the world with his invention of the electric light. W...
A.
he became a telegraph operator, a newsboy, and then got his first patent
B.
he became a newsboy, got his first patent, and then became a telegraph operator
C.
he got a patent, became a telegraph operator, and then became a newsboy
D.
he became a newsboy, a telegraph operator, and then got a patent
【判断题】土石坝出险方向无规律,纵横交错,缝间距较均与的裂缝,这种裂缝是水平裂缝。
A.
正确
B.
错误
【多选题】压力容器制造质量的优劣,主要取决于 [填空(1)] 、 [填空(2)] 和 [填空(3)] 。
A.
材料质量
B.
焊接质量
C.
检验质量
【判断题】单车的成功,不代表着双创的成功。
A.
正确
B.
错误
【多选题】可以用无机金属盐与铜反应变色进行定性检测的金属有以下哪些?
A.
B.
C.
D.
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