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【多选题】
目视助航灯光系统下列描述中正确的是（）。
A.
灯泡连接在隔离变压器的次级
B.
灯泡发光强度与回路电的电流成正比
C.
灯光回路由一系列隔离变压器串联构成
D.
灯光回路由一系列隔离变压器并联构成
E.
灯光系统光强一般分为3个等级
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