A、<img src='/s/tiw/p3/UpLoadImage/2019-07-04/1b758c04-f4b4-4a5f-8402-d7998872edf9.png' title='a1.png'>，<img src='/s/tiw/p3/UpLoadImage/2019-07-04/2922b133-353d-4679-8362-d99fd0d528f3.png' title='a2.png'>
B、<img src='/s/tiw/p3/UpLoadImage/2019-07-04/74fa1612-396a-4a68-9d6c-f1dba69ed625.png' title='b1.png'>，<img src='/s/tiw/p3/UpLoadImage/2019-07-04/0a147013-68f0-41f8-886f-179dc6187e1a.png' title='b2.png'>
C、<img src='/s/tiw/p3/UpLoadImage/2019-07-04/a1157b35-1463-4514-a0c0-611a725b3179.png' title='c1.png'>，<img src='/s/tiw/p3/UpLoadImage/2019-07-04/52970c47-11ff-4b59-87ee-2f83baa3c49a.png' title='c2.png'>
D、<img src='/s/tiw/p3/UpLoadImage/2019-07-04/e47b0045-bbce-486a-bc4a-699c6ca32379.png' title='d1.png'>，<img src='/s/tiw/p3/UpLoadImage/2019-07-04/d645be90-df62-4788-b4de-1106dfc8d22d.png' title='d2.png'>
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试题解析
电压降落是指电力网中，首端相电压与末端相电压的相量差，是一个矢量，即：
；电压损耗是指输电线路首端和末端电压的绝对值之差，即：
