题目内容

In her bedroom I found mismatched __1__ on the bed and purple pants on the closet floor. Desk drawers are filled with school papers, __2__by year and subject. I __3__ myself reading through poems and essays, admiring high scores on tests and reading her name printed or typed neatly in the __4__ of each paper. I __5__ desk contents into a box. Six months, I think. I'll give her six months to collect her ___5__ , and then I'll throw them all away. That is fair. __6__pay for storage.

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I turned the bed over. A large brown envelope is __1__ "DON NOT THROW AWAY" I open it. More papers. I __2__ the contents onto the floor. They are old family photographs, letters, greeting cards and __3__ from us to her. There are comics __4__ from newspapers and magazines. Every single item in this envelope has passed from our hands to __5__, These are all things that we give her. Suddenly, I feel very __6__.

三相对称电路是指( )。

A. 电源对称电路
B. 负载对称的电路
C. 电源和负载均对称的电路
D. 三相电压对称电路

三相负载对称是指( )。

A. 各阻抗相等
B. 阻抗角相等
C. 各阻抗值相等,且阻抗角相等
D. 电阻值相等,阻抗角相等

在低压三相四线制回路中,要求中性线不能( )。

A. 装设电流互感器
B. 装设电表
C. 安装漏电保护器
D. 安装熔断器

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