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单项选择题

下列人防工程有关防火、防烟分区的条文哪两条是正确的？Ⅰ.火分区的划分宜与人防工程的防护单元相结合Ⅱ.每个防火分区的最大允许使用面积不应超过500㎡Ⅲ.影院、礼堂的观众厅防火分区的最大允许使用面积不应超过1000㎡，当设有自动灭火设备时，其面积可扩大50%Ⅳ.烟分区不应跨越防火分区( )

A.Ⅰ、Ⅱ
B.Ⅱ、Ⅲ
C.Ⅲ、Ⅳ
D.Ⅰ、Ⅳ
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单项选择题
I’ve loved my mother’s desk since I was just tall enough to see above the top of it as mother sat doing letters. Standing by her chair, looking at the ink bottle, pens, and white paper, I decided that the act of writing must be the more wonderful thing in the world.
Years later, during her final illness, mother kept different things for my sister and brother. “But the desk,” she’d said again, “it’s for Elizabeth.” I never saw her angry, never saw her cry. I knew she loved me; she showed it in action. But as a young girl, I wanted heart-to-heart talks between mother and daughter.
They never happened. And a gulf opened between us. I was “too emotional”. But she lived “on the surface”.
As years passed I had my own family. I loved my mother and thanked her for our happy family. I wrote to her in careful words and asked her to let me know in any way she chose that she did forgive me.
I posted the letter and waited for her answer. None came.
My hope turned to disappointment, then little interest and, finally, peace—it seemed that nothing happened. I couldn't be sure that the letter had even got to mother. I only knew that I had written it, and I could stop trying to make her into someone she was not.
Now the present of her desk told, as she’d never been able to, that she was pleased that writing was my chosen work. I cleaned the desk carefully and found some papers inside—a photo of my father and a one-page letter, folded and refolded many times.
Give me an answer, my letter asks, in any way you choose. Mother, you always chose the act that speaks louder than words.
What did mother do with her daughter’s letter asking forgiveness?（　　
A.Shehadneverreceivedtheletter
B.Foryears,sheoftentalkedabouttheletter
C.Shedidn’tforgiveherdaughteratallinallherlife
D.Shereadtheletteragainandagaintillshedied
单项选择题
图为同步发电机的外特性曲线，已知这四条曲线是负载分别为cosΦ=0.6（感性）、cosΦ=0.8（感性）、cosΦ=0.6（容性）及纯阻性四种情况下所测得的。其中______为cosΦ=0.6（容性）负载所对应的。（  ）
A．A
B．B
C．C
D．D
问答题
汽车上装有两个电源，即（      ）和（      ）。
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