My mother's work is _____ (make) our city safe.
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电流互感器二次回路阻抗增加时,其电流误差和角误差()
A. 均增加
B. 均减小
C. 电流误差增加,角误差减 小。
Jason is used to ______ (watch) TV the whole night.
I think the ______ (four) lesson is the most difficult in this book.
Which director is given the opening speech at the Annual General Meeting()
A. Sales
B. Personnel
C. Finance