多项选择题

交—交变频器（电压型）和交—直—交变频器各有特点，下列哪些项符合交—交变频器特点？（）

A.换能环节少
B.换流方式为电源电压换流
C.元件数量较少
D.电源功率因数较高

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多项选择题

10kV架空电力线路的导线材质和导线的最大使用张力与绞线瞬时破坏张力的比值，下列哪几项符合规范规定？（）

A.铝绞线30%
B.铝绞线35%
C.钢芯铝绞线45%
D.钢芯铝绞线50%

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A.W:
B.
W:
C.
W:
D.
How
E.Cut
F.
B.Part
G.
C.Both
H.

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