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【多选题】
送电线路巡视工作“六要六步八禁”中的“六要”是指：（）
A.
作业人员要无妨碍高空作业的病症，经过培训，持证上岗
B.
要有完整准确的线路杆塔台帐资料
C.
要有经批准的巡视作业指导书（卡）
D.
要有合格、齐备的劳动防护用品和安全工器具
E.
暑天、山区作业要配备防暑药、蛇药等急救药品
F.
夜间巡视要有足够照明
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参考解析：
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【单选题】某高压输电线的波阻抗Zc= 380∠- 60°Ω，在终端匹配时始端电压为U1=147kV,终端电压为U2 = 127kV,则传输线的传输效率为（）。
A.
64.4%
B.
74.6%
C.
83.7%
D.
90.2%
【单选题】Subways are underground trains, which usually operate 24 hours a day. They are found in larger cities and usually run between the suburbs and the downtown area. Maps and schedules are available from t...
A.
within downtown areas
B.
away from city centers
C.
in or outside big modern cities
D.
between suburbs and city centers