单项选择题

某单回采用猫头塔的220kV送电线路，若导线间水平投影距离4m，垂直投影距离5m，其等效水平线距为多少米？（ ）

A.4.0m
B.5.0m
C.7.8m
D.9.0m
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听力原文：M: The plane was supposed to arrive in Shenzhen at ten o'clock.W: Ten o'clock! But it's already ten-thirty!What does the woman mean?A.They're going to be very latE.B.The plane doesn't fly near Shenzhen.C.Tile plane is going to lanD.
A.W:
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单项选择题
架空输电线路设计中，对于验算地线热稳定时地线的允许温度，下列哪种说法是正确的？（ ）
A.钢芯铝绞线和钢芯铝合金绞线可采用＋200℃
B.钢芯铝绞线和钢芯铝包钢绞线可采用＋200℃
C.钢芯铝绞线和铝包钢绞线可采用＋300℃
D.镀锌铝绞线和铝包钢绞线可采用＋400℃
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