电影《钢的琴》基于整个作品的著作权由（）享有。 A.制片者 B.导演 C.演员 D.

下列关于阵发性睡眠性血红蛋白尿的叙述错误的是（）.

A.PNH是红细胞膜的获得性缺陷引起的对激活补体异常敏感的一种慢性血管外溶血

B.血象检查血红蛋白常低于60g／L

C.患者尿含铁血黄素试验（Rous试验）可持续阳性

D.蔗糖溶血试验可用作初步筛选

E.Rous试验特异性高，是诊断的重要依据

某中学在学生宿舍楼顶安装了十台相同的太阳能、电能两用热水器，供学生洗澡．每台热水器容积为100L．在一般光照条件下，一满箱15℃的水经白天太阳加热，温度可达到45℃，求

（1）10台热水器获得的太阳能相当于多少千克天然气完全燃烧放出的热量？（已知水的比热容为4.2×10³J/（kg•℃），天然气的热值为8.4×10⁷J/kg）

（2）学生宿舍楼层高3m，热水器安装在八楼楼顶，那么该地区地面的水压至少要多大，才能顺利为热水器上水？（大气压p₀=1.0×10⁵Pa，g取10N/kg）

（3）如果遇到雨天，则要用电加热，那么将一台装满水的热水器中的水由15℃加热到45℃需要多长时间？（已知每台热水器的电功率为1.5KW，设所消耗的电能全部转化为水的内能）．

阅读理解。

                                                                                   Three Boys and a Dad

     Brad closed the door slowly as Sue left home to visit her mother. Expecting a whole day to relax, he was thinking

whether to read the newspaper or watch his favourite TV talk show on his first day off in months. "This will be like a

walk in the park," he'd told his wife. "I'll look after the kids, and you can go visit your mom."

      Things started well, but just after eight o'clock, his three little "good kids"-Mike, Randy, and Alex-came down

the stairs in their night clothes and shouted "breakfast, daddy." When food had not appeared within thirty

seconds, Randy began using his spoon on Alex's head as if it were a drum. Alex started to shout loudly

in time to the beat(节拍). Mike chanted "Where's my toast, where's my toast" in the background. Brad

realized his newspaper would have to wait for a few seconds.

      Life became worse after breakfast. Mike wore Randy's underwear on his head. Randy locked himself in

the bathroom, while Alex shouted again because he was going to wet his pants. Nobody could find clean

socks, although they were before their very eyes. Someone named "Not Me" had spilled a whole glass of

orange juice into the basket of clean clothes. Brad knew the talk show had already started.

      By ten o'clock, things were out of control. Alex was wondering why the fish in the jar refused his bread

and butter. Mike was trying to show off his talent by decorating the kitchen wall with his colour pencils.

Randy, thankfully, appeared to be reading quietly in the family room,but closer examination showed that he was

eating apple jam straight from the bottle with his hands. Brad realised that the talk show was over and reading

would be impossible.

     At exactly 11:17, Brad called the daycare centre (日托所)."I suddenly have to go into work and my wife's

away. Can I bring the boys over in a few minutes?" The answer was obviously "yes" because Brad was smiling.

1. When his wife left home. Brad expected to          .        

A. go out for a walk in the park          

B. watch TV talk show with his children

C. enjoy his first day off work          

D. read the newspaper to his children

2. Which of the following did Randy do?

A. Drawing on the wall                

B. Eating apple jam

C. Feeding the fish.                    

D. Reading in a room

3.Why did Brad ask the daycare centre for help?

A. Because he wanted to clean up his house.

B.Because he suddenly had to go to his office

C. Because he found it hard to manage his boys home.

D. Because he had to take his wife back

 4.This text is developed        .

A. by space

B. by comparison

C. by process

D. by time

什么是液态合金的充型能力？合金的流动性取决于那些因素？合金的流动性不好对铸件质量有何影响？为什么铸钢的流动性比铸铁差？

判断切换的准则是什么？