在“测量小灯泡电功率”的实验中,小灯泡的额定电压为2.5伏,电阻大约为10欧,有

题型:实验题

问题:

在“测量小灯泡电功率”的实验中,小灯泡的额定电压为2.5伏,电阻大约为10欧,有两个规格分别为“10Ω 1A”、“50Ω 2A”的滑动变阻器,电源电压为6V.

(1)本实验中应选择规格为“      ”的滑动变阻器;如图已有部分电路连好,请用笔画线代替导线将电路连接完整.

(2)某同学闭合开关后,移动滑动变阻器的滑片,发现灯泡的亮度很暗且不变,可能的原因是                       .

(3)排除故障后,移动滑动变阻器的滑片,进行了多次测量,首先使小灯泡两端的电压等于额定电压,接着使小灯泡的两端的电压低于额定电压,最后使小灯泡两端的电压约为额定电压的      倍,这样做的目的是                            

考点:测量电功率的实验
题型:实验题

第二节:语法填空(共10小题,每小题1.5分,满分15分)

阅读下面短文,根据上下文填入适当的词语,或使用括号中的词语的适当形式填空,并将答案填写在答案卡上标号为16-25的相应位置。

The longer I live, the more I realize the impact of attitude on life.

Attitude, to me, is  16  important than facts. It is more important than the past, than education, than money, than circumstances, than failures, than successes, than 17   other people think, say, or do.

It is more important than appearance, giftedness, or skill. It will make or break a company, a church, a home.

The 18   (remark) thing is we have a choice every day regarding the  attitude we will embrace(接受) for that day.

We cannot change 19  past. We cannot change the 20  that people will act in a certain way. We cannot change 21  inevitable(不可避免的). The only thing we can do is 22  (play) on the one string we have, and that is our attitude.

I am convinced 23   life is 10% what happens to me and 90% how I react to it. 24  so it is with you. We are 25   charge of our attitudes.

题型:实验题

胸膜腔的压力通常

A.高于大气压 

B.等于大气压 

C.低于大气压 

D.高于大气压2kPA. 

E.高于大气压2mmHg

题型:实验题

患儿男,3岁。8小时前额部不慎碰伤,出现血肿,约半个乒乓球大小。患儿既往无出血病史,其舅舅经常出现血肿情况。体检:发育正常,轻度贫血貌,皮肤无出血点,心肺(-),腹软,肝脾未及,余无异常发现。

血友病筛选试验的结果应是

A.PT和APTT延长

B.PT延长和APTT正常

C.PT、BT、TT正常和APTT延长

D.BT和APTT延长

E.BT延长和APTT正常BT和PT延长

题型:实验题

关于聚丙烯酸叙述不正确的是()

A.易溶于水、乙醇、甲醇和乙二醇等极性溶剂。

B.其聚合反应一般在50-100℃的乙醇中进行。

C.溶解度越高,粘度也越大。

D.聚丙烯酸可以被氢氧化钠中和。

题型:实验题

建设项目信息分类体系中信息类目的设置有着极强的______。

A.逻辑性
B.稳定性
C.兼容性
D.综合实用性

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