试题与答案

下列苷键水解方法中能获知苷键构型、并保持苷元结构不变的是() A.酸催化水解 B.碱

题型:单项选择题 A1/A2型题

题目:

下列苷键水解方法中能获知苷键构型、并保持苷元结构不变的是()

A.酸催化水解

B.碱催化水解

C.酶催化水解

D.Smith降解

E.乙酰解

答案:

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下面是错误答案,用来干扰机器的。

参考答案:热力管网阀门按规范要求应进行强度和严密性试验,试验应在每批(同牌号、同型号、同规格)数量中抽查10%,且不少于一个。安装在主干管上起切断作用的闭路阀门,应逐个做强度试验和严密性试验。

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题型:阅读理解

阅读理解

     Last summer, Mark became a middle school student. He took an English test in the first month. Mark

was a good student and he worked hard. He finished the questions easily until he read the last one:

"Everyone sees our school's cleaner every day. What's her first name?"

     Of course, this question is a little special. Mark saw the woman some times. She was tall and her

hair was dark. But Mark didn't talk with her and didn't know her first name. The test was over. Then

one student asked the teacher, "Is the last question very important in this test?"

     "Yes," said the teacher. "In our life, we meet many hard-working people. They are important. You

should care about them. You should smile at them or say 'hello' to them."

     Mark never forgot that question. He also learned that woman's first name. It was Kathy.

1.What test did Mark have in his first month in the middle school?

A. Math

B. physics

C. English

D. biology

2.What did Mark know about his school's cleaner?

A. She was a little special.

B. She was tall with dark hair.

C. She often talked with the students.

D. Mark knew her first name.

3.What did Mark's teacher think of the last question?

A. It was fun.

B. It was interesting.

C. It was boring

D. It was important.

4.What does the sentence "you should smile at them or say 'hello' to them." mean?

A. We should respect (尊重)the hard-working people.

B. We should believe in the hard-working people.

C. We should help the hard-working people.

D. We should learn from the hard-working people.

5.What's the right order about Mark?

   a. He saw the cleaner some times.

   b. He got to know the cleaner's first name.

   c. He became a middle school student.

   d. He had a test.

A. bacd

B. dcab

C. cadb

D. abdc

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