学校STS研究小组在综合实践活动中,利用小灯泡、滑动变阻器和几个定值电阻设计了两

题型:问答题

问题:

学校STS研究小组在综合实践活动中,利用小灯泡、滑动变阻器和几个定值电阻设计了两个模拟调光灯的电路,如图所示.从调光的效果看,你认为哪种设计电路更为合理?简要说明你的理由.

考点:滑动变阻器
题型:问答题

患者男,58岁。活动后胸闷、气短2年。有高血压、高血脂病史。查体:血压160/110mmHg,生化检查示空腹血糖10.6mmol/L,三酰甘油3.1mmol/L,ECG正常。

该患者的药物治疗原则是()。

A.降压治疗

B.降糖治疗

C.调脂治疗

D.抗凝治疗

E.抗血小板治疗

F.抗感染治疗

题型:问答题

单位十周年庆典,让你负责插画,制作画册等策划工作,你对单位情况不了解,而大家都忙,没有人帮助你,你怎么办

题型:问答题

阅读理解。

     When I was small and my grandmother died, I couldn't understand why I had no tears. But that night

when my dad tried to cheer me up, my laughs turned into crying.

      So it came as no surprise to learn that researchers believe crying and laughing are controlled by the

same part of the brain. Just as laughing has many health advantages, scientists are discovering that so

does crying.

      Whatever helps us to reduce pressure is important to our emotional health, and crying seems to

work well. One study found that 85 percent of women and 73 percent of men report feeling better after

crying.

      Besides, tears attract help from other people. Researchers agree that when we cry, people around us

become kinder and friendlier and they are more ready to provide support and comfort. Tears also enable

us to understand our emotions better; sometimes we don't even know we're very sad until we cry. We

learn about our emotions through crying, and then we can deal with them.

      Just as crying can be healthy, not crying---holding back tears of anger, pain or suffering-can be bad

for physical health. Studies have shown that too much control of emotions can 1ead to high blood

pressure, heart problems and some other illness. If you have a health problem, doctors will certainly not

ask you to cry. But when you feel like crying, don't fight it. It's a natural, healthy and emotional response.

1. Why didn't the author cry when her grandmother died?      

A.   Because her father did not want her to feel too sad.

B.   Because she did not love her grandmother.

C.  Because she was too shy to cry at that time.

D.  The author doesn't give the explanation.

2. It can be inferred from the text that                     .    

A.   there are two ways to keep healthy

B.   emotional health has a close relationship to physical health

C.   crying and laughing play the same roles

D.   crying does more good to health than laughing

3. According to the author, which of the following statements is true?

A.  Crying is the best way to get help from others.

B.   Fighting back tears may cause some health problems.

C.   We will never know our deep feelings unless we cry.

D.   We must cry if we want to reduce pressure

4. What might be the most suitable title for the text? 

A. Why We Cry                

B. How to Keep Healthy

C. Power of Tears              

D. New Scientific Discovery

5. What is the author's attitude to "crying"?

A. Positive.  

B. Negative.    

C. Touched.    

D. Upset.

题型:问答题
用毛皮摩擦过的橡胶棒,靠近用细线吊起的轻小通草球产生互相吸引的现象,则这个通草球(   )

A.一定带正电

B.一定带负电

C.有可能带正电,有可能不带电

D.一定不带电

题型:问答题

船舶顶流过弯,水流有将船首压向哪侧的趋势:()

A.凸岸

B.凹岸

C.浅水侧

D.航道中间

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