乐当家理财卡卡片有效期为（）年，并按年收取账户管理费。A.2 B_爱下问搜题

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问题单项选择题

乐当家理财卡卡片有效期为（）年，并按年收取账户管理费。

A.2

B.3

C.4

D.5

答案

参考答案：D

单项选择题

若Z0,Z1,Z2分别表示零序,正序,负序阻抗，Z1=Z2，Zl和Zm表示A,B,C坐标系统中的自阻抗和互阻抗，则Z0=()

A、Zl+2Zm

B、Zl-Zm

C、Zl-Zm

选择题

David ________ from the analysis of the traffic accident that it had been caused by human error.[ ]

A. announced

B. acknowledged

C. concluded

D. considered