关于做平抛运动的物体,下列说法正确的是( ) A.平抛运动是非匀变速曲线运动 B

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问题:

关于做平抛运动的物体,下列说法正确的是(  )

A.平抛运动是非匀变速曲线运动

B.平抛运动是匀变速曲线运动

C.每秒内速度的变化量相等

D.每秒内速率的变化量相等

考点:平抛运动
题型:多选题

可以充分说明反应 P(g)+Q(g)R(g)+S(g)在恒温下已达到平衡的是[     ]

A.反应容器内的压强不随时间改变

B.反应容器内P、Q、R、S四者浓度之比为1:1:1:1

C.P的生成速率和S的生成速率相等

D.反应容器内的气体总物质的量不随时间变化

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跨经度最多的大洲和大洋分别是(  )

A.亚洲和太平洋

B.南美洲和大西洋

C.南极洲和北冰洋

D.非洲和印度洋

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B

I’ve loved my mother’s desk since I was just tall enough to sit above the top of it. Mother sat writing letters. Standing by her chair, looking at the ink bottle, pens, and white paper, I decided that the act of writing must be a most wonderful thing in the world.

Years later, during her final illness, Mother kept different things for my sister and brother. “But the desk,” she said again, “is for Elizabeth.”

I never saw her angry, never saw her cry. I knew she loved me; she showed in action. But as a young girl. I wanted to have heart-to-heart talks between mother and daughter.

They never happened. And a gulf opened between us. I was “too emotional (易动感情的)”. But she lived “on the surface (表面)”.

As years passed and 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.

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.

But the present of her desk told me, 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-paper letter, folded and refolded many times. It was my letter.

“In any way you choose, Mother, you always chose the act that speaks louder than words.”

小题1:The writer began to love her mother’s desk________.

A.after Mother died

B.after she wrote the letter

C.when she was a child

D.when Mother gave it to her小题2:The passage shows that_________.

A.Mother was cold on the surface but kind in her heart to her daughter

B.Mother was too serious about her daughter in words

C.Mother wrote to her daughter in careful words

D.Mother wrote to her daughter in careless words小题3:Which of the following is NOT true?

A.The author may work as a writer

B.The author and her mother love each other, but didn’t say it out

C.Neither the author nor her mother had a happy family.

D.The author’s mother is a person who prefers act to words.小题4:What did Mother do with her daughter’s letter asking for forgiveness?

A.She had never received the letter.

B.For years, she often talked about the letter.

C.She didn’t forgive her daughter at all in all her life.

D.She read the letter again and again till she died.小题5:What’s best title of the passage?

A.My letter to Mother

B.Mother and children

C.My Mother’s Desk

D.Talks between Mother and me

题型:多选题

JZ-7型空气制动机实施常用制动时,()不充不排,仍保持制动前的定压。

A、作用风缸

B、降压风缸

C、工作风缸

D、紧急风缸

题型:多选题

辨说

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