凝结泵轴向间隙的调整方法及标准是什么？

阅读下面的宋词，然后回答问题。

　　[注]①向子，官至户部侍郎，因反对秦桧议和而被免官。

（1）“斜红叠翠”一句，“红”“翠”和“斜”“叠”对春景的描写各有其妙，请简要分析。

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（2）本词隐含了怎样的伤感之情？

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临产后的主要产力为______，第二产程中的重要辅助产力为______，协助胎头内旋转及仰伸的产力是______。

阅读理解。

     Worrying about how you'll perform on a math test may actually contribute to a lower test score, US

researchers said on Saturday.

      Math anxiety-feelings of dread and fear and avoiding math-can weaken the brain's limited amount of

working capacity, a resource needed to calculate difficult math problems, said Mark Ashcrafi, a psychologist

at the University of Nevada Las Vegas who studies the problem.

     "It turns out that math anxiety occupies a person's working memory," said Ashcraft, who spoke at the

annual meeting of the American Association for the Advancement of Science in San Francisco.

     Ashcraft said while easy math tasks such as addition require only a small part of a person's working

memory, harder calculations require much more.

      Worrying about math takes up a large part of a person's working memory stores as well, spelling disaster

for the anxious student who is taking a high-stakes test ( 高风险测验).

     Stress about how one does on tests like college entrance exams can make even good math students choke.

"All of a sudden they start looking for the short cuts," said University of Chicago researcher Sian Beilock.

     Although test preparation classes can help students get over this anxiety, they are limited to students whose

families can afford them.

     Finally, she said, "It may not be wise to rely completely on scores to predict who will succeed."

     While the causes of math anxiety are unknown, Ashcraft said,"People who manage to get over math

anxiety have completely normal math ability."

1. Sian Beilock points out that stress________.

A. can't be avoided before college entrance exams

B. contributes to scores in college entrance exams

C. has no effects on good math students

D. has side effects on students in college entrance exams

2. What does the underlined word "spelling" probably mean?

A. causing

B. reducing

C. taking away

D. preparing for

3. What can we learn from the text?

A. The causes of math anxiety have already been found.

B. All of the students attend test preparation classes.

C. Math anxiety weakens working memory needed to do math.

D. Few measures can be taken to get rid of math anxiety.

4. What does the passage suggest middle school students do before exams?

A. Get relieved.

B. Review lessons.

C. Go to the doctor's.

D. Rely on scores.

当可燃物的温度达到燃点即可开始持续燃烧。

哪个是作用时间长的抗心绞痛药，又名异山梨酯（）

A．氟伐他汀

B．呋塞米

C．硝酸异山梨酯

D．盐酸地尔硫

E．利舍平