单项选择题
A.1100m B.1300m C.1600m D.1800m
A.正弦 B.余弦 C.正切 D.余切
A.-20℃一40℃ B.-25℃一45℃ C.-30℃一45℃ D.-30℃一50℃
A.110kV或220kV B.27.5kV或55kV C.27.5kV或29kV D.110kV或55kV
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