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【多选题】
多选题母线短路失压的主要现象有（）。
A.
后台显示相关保护动作信息，母线电压显示为零
B.
母线发生短路故障，系统出现强烈冲击
C.
现场出现支柱绝缘子断裂或异常声响、火光、冒烟等现象
D.
保护动作，断路器跳闸
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【单选题】Directions: In this part, you will have 15 minutes to go over the passage quickly and answer the questions on Answer Sheet 1. For questions 1-7, choose the best answer from the four choices marked A),...
A.
He collected it from the newspaper he subscribed to.
B.
He found it when thumbing through a magazine.
C.
He chanced upon it on a fridge when visiting a friend.
D.
He worked for the financial newspaper IBD.
相关题目：
【单选题】Directions: In this part, you will have 15 minutes to go over the passage quickly and answer the questions on Answer Sheet 1. For questions 1-7, choose the best answer from the four choices marked A),...
A.
He collected it from the newspaper he subscribed to.
B.
He found it when thumbing through a magazine.
C.
He chanced upon it on a fridge when visiting a friend.
D.
He worked for the financial newspaper IBD.
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