分别从原理、衍射特点及应用方面比较X射线衍射和透射电镜中的电子衍射在材料结构分析中的

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问题:

分别从原理、衍射特点及应用方面比较X射线衍射和透射电镜中的电子衍射在材料结构分析中的异同点。

考点:材料科学材料分析测试技术材料分析测试技术题库
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阅读短文,选择正确答案。

    When this story happened, they were working around a very large house. Their job was to do the cleaning. It

was not a difficult job, but sometimes it was a little dangerous, because they had to walk below where workmen

were working. Often these workmen dropped something from the top of the house many meters high to the

ground. One morning Joe was working near the house with a cigarette(香烟) behind one of his ears. Suddenly

somebody on the top shouted, "Look out!" But Joe did not "look out". He looked up. And as he did so, a long

knife missed Joe's head, but it cut off one of his ears. At once he put his hand to one side of his head and cried

out, "I've lost an ear. Help! Help!" Jeff ran up to help his friend. "Look for my ear," Joe told him. "It must be on

the ground somewhere." Jeff looked everywhere for the missing ear. At last he found an ear on the ground. He

picked it up and carried it to Joe. "Here you are," he said, "I've found it." Joe looked at it. "No, that's not my ear."

he said, "Mine had a cigarette behind it."

1. What were Joe and Jeff? [ ]

A. Soldiers.

B. Drivers.

C. Farmers.

D. Cleaners.

2. How did Joe lose his ear? [ ]

A. He cut it off by himself.

B. Jeff cut it off with a knife.

C. A falling knife cut it off.

D. A cigarette burned it up.

3. At the end of the story Jeff found _______. [ ]

A. someone else's ear

B. Joe's ear

C. a long knife

D. a cigarette

4. From the passage, we know Joe was not _______. [ ]

A. strong

B. kind

C. foolish

D. clever

5. Which is the most possible title for this passage? [ ]

A. A Lost Ear

B. A Busy Cleaner

C. A Falling Knife

D. A forgetful Man

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患者,男,47岁,牙周病,接受牙周基础治疗后,医生对他进行了口腔健康教育和口腔卫生训练,下面是其中一些有关刷牙方面的内容。

能较为有效地清除龈缘附近及龈沟内菌斑的刷牙方法是()

A.TheBASSmethod

B.Fones刷牙法

C.改良的Stillman刷牙法

D.Chart刷牙法

E.竖刷法

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急性胰腺炎时血清淀粉酶活性上升,最高峰值出现在

A.发病后2小时

B.发病后4小时

C.发病后6小时

D.发病后12~24小时

E.发病后36小时

题型:问答题 简答题

某工程柱混凝土采用细石子(最大粒径16mm),当无其他可靠措施保证混凝土不产生离析时,采用串筒施工时,混凝土的最大自由倾落高度为()m。

A.2

B.3

C.4

D.6

题型:问答题 简答题

在证券发行制度中,( )实质上是一种发行公司的财务公布制度。

A.审批制
B.特许制
C.核准制
D.注册制

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