在回油节流调速回路中,节流阀处于节流调速工况,系统的泄漏损失及溢流阀调压偏差均忽略不

题型:多项选择题

问题:

在回油节流调速回路中,节流阀处于节流调速工况,系统的泄漏损失及溢流阀调压偏差均忽略不计。当负载F增加时,泵的输入功率(),缸的输出功率()。

A.增加

B.减少

C.基本不变

D.可能增加也可能减少

考点:电子与通信技术液压传动与控制液压传动与控制题库
题型:多项选择题

阅读理解。

     Although it's foolish to smoke, fifty million people in the United States still do that. Most of them

want to give up smoking, but smoking is a habit that is not easy to break. Luckily, thirty-five million

Americans have stopped it.

     Frank used to (过去常常) smoke a lot. He started to smoke when he was 16. Many of his friends

were doing it, and it made him feel like a grown-up. His parents told him that he was making a mistake,

but he didn't listen to them. When he joined the football team in the United States, he stopped smoking,

but then he started again.

     A month ago, he had a pain in his chest and stomach. "The pain isn't too bad. I'm sure it will go away

and I'll be fine. I probably eat too much," he told his wife, Helen. But it didn't go away and they both

began to worry. Frank called the doctor. The doctor told him that Helen should drive him to the hospital

right away. They examined his heart, took a chest X-ray, and kept him in the hospital overnight (一整夜).

      The next day his doctor read the X-ray report. He told Frank that he was okay, and that he could

be back to work after a few days' rest. But he advised him to stop smoking. Frank and Helen were very

happy. They were afraid that they were going to get bad news.

     Since Frank stopped smoking, he has been feeling better. He doesn't cough in the morning the way

he used to. His house and car don't have smell of smoke, and his wife and children are breathing cleaner

air.

l. Today, the number of smokers in the United States is _____ it used to be. 

A. larger than          

B. smaller than

C. as large as          

D. the same as

2. Frank started to smoke when he was _____.

A. a football player

B. fifteen years old

C. with many of his friends

D. sixteen years old

3. What was wrong with Frank a month ago?   

A. He ate too much.

B. He had a pain in his chest and stomach.

C. He stayed in the hospital overnight.

D. He took a chest X-ray.

4. —In the hospital, why did they think they might get bad news?

    —Because _____.

A. Frank smoked a lot for a long time

B. he was kept in the hospital overnight

C. the pain didn't go away quickly

D. all of the above  

题型:多项选择题

下列控件中,用来显示窗体或其他控件的说明文字,而与字段没有关系的是( )。

A) 命令按钮
B) 标签
C) 文本框
D) 复选框

题型:多项选择题

(一)现代诗赏读(《化石吟》节选,4分)

你把我的思绪引向远古,

描绘出一幅幅生物进化的图画;

你否定了造物主的存在,

冰冷的骸骨把平凡的真理回答。

肉体虽早已腐朽化为乌有,

生之灵火却悄然潜行在地下,

黑色的躯壳裹藏着生命的信息,

为历史留下一本珍贵的密码。

小题1:.第一节中“造物主的存在”是什么样的理论?“平凡的真理”是什么意思?(2分)                                                                          

小题2:.诗中称化石为“你”有什么好处?(2分)

                                                                   

题型:多项选择题

关于擦伤、撕裂伤、刺伤的叙述正确的是()。

A.这些损伤的共同点是有出血现象和伤口

B.处理原则是止血和保护伤口

C.小面积擦伤,污染不严重者用红药水或紫药水涂抹即可,无需包扎

D.以上都正确

题型:多项选择题

抗结核药联合用药的目的是:()

A.扩大抗菌谱

B.增强抗菌力

C.延缓耐药性产生

D.减少毒性反应

E.延长药物作用时间

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