PLC中的内部器件有1和0两种状态，分别对应于继电器的接通“ON”、断开“OFF”两

a代表有理数，那么，a和-a的大小关系是（　　）

A．a大于-a

B．a小于-a

C．a大于-a或a小于-a

D．a不一定大于-a

试着对光合作用和化能合成作用作简单的比较？

首次提出"儿枕腹痛"的著作是

A．《妇人良方大全》

B．《傅青主女科》

C．《医学入门》

D．《景岳全书》

E．《金匮要略》

The 47-year-old singer talks about the new album Symphony（交响乐） that came out of a “very dark time”, including her decision to give up trying to have children. “People have suggested I could adopt,” Brightman says. “But work is central to my life now. And so I am going to put it to one side. After a while not having children becomes the norm and perhaps that might sound alarming, to parents especially, but I have never known anything different. I’m not hurt by not having children. My life and career are incredibly rich.”

Talking about growing up in a large family in Berkhamsted (father a property developer who later committed suicide), she says: “I was gifted as a child, and very musical. I seemed to be good at anything to do with the arts. At 5，I understood the music I was dancing to and had an eye for costume.” She first appeared in a West End musical at 11 and hated boarding school.

Brightman led the saucy dance troupe（辣妹三人舞） Hot Gossip and had her first hit with I Lost My Heart to a Starship Trooper in 1978. At 18 she married a music manager called Andrew Graham Stewart. “I was probably in love but I can’t remember. Girls change such a lot between 18 and 22. It didn’t really work out.” In 1981 she was spotted by Lloyd Webber. She became his leading lady in Song and Dance, Requiem and Phantom of the Opera. They married in 1984.

Brightman says she felt hostility(敌意) “from the beginning. I haven’t tried to understand it. I’ve done very well everywhere else, especially the US, where I now live, I just accept it for what it is. The more you are away from Britain, the more you appreciate it. But I don’t miss it, although I miss my family. Our profession can be uncomfortable but I enjoy what I do. I get on with it.”

小题1: The first paragraph tells us that _____.

A．Brightman is very popular around the world except in America

B．Brightman’s musical style is a mixture of opera, pop and jazz

C．the British people don’t like her for her style of music

D．Brightman is much older than Andrew Lloyd Webber小题2: Brightman decided to give up having children because _____.

A．she could adopt one

B．her life and career were unbelievably rich without children

C．she felt it normal not to have children

D．she was too busy小题3:The following statements are true except ______.

A．Brightman first appeared in a West End musical at 5

B．Brightman disliked life on the campus

C．Brightman was very gifted when she was young

D．The saucy dance troupe made Brightman famous小题4:The underlined word in the fourth paragraph probably means _____.

A．located

B．admired

C．followed

D．found小题5: What does the author try to say in the last paragraph by quoting Brightman’s words?

A．Brightman has to accept the fact that she is not liked in Britain

B．Brightman lives in America but she loves her own country

C．The British coldness towards Brightman led to her hatred to her homeland

D．Brightman was at a loss why she was not welcome in Britain

下列关于型钢的相关说法中，错误的是（）。

A.与工字钢相比，H型钢优化了截面的分布，具有翼缘宽，侧向刚度大，抗弯能力强，翼缘两表面相互平行、连接构造方便，重量轻、节省钢材等优点

B.钢结构所用钢材主要是型钢和钢板

C.不等边角钢的规格以"长边宽度×短边宽度×厚度"（mm）或"长边宽度／短边宽度"（cm）表示

D.在房屋建筑中，冷弯型钢可用做钢架、桁架、梁、柱等主要承重构件，但不可用作屋面檩条、墙架梁柱、龙骨、门窗、屋面板、墙面板、楼板等次要构件和围护结构