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【简答题】
I’m sorry but.... I work as a dentist’s assistant and people often say very funny things when they come to see the dentist. Here are some of them. Roland had an 11 o'clock appointment. He phoned at 12 o'clock and said, "I'm sorry that I missed my appointment. My alarm clock broke." And then there was Sally who said, "I'm sorry I couldn't come yesterday for my appointment, but my pet mouse died." Colin's mother always makes appointments for him. But he always finds a good excuse not to come. One day he rang and told me, "My sister called the police. She said I had hit her. They came and asked me questions for an hour. Then she told them that it was a joke!" 12-year-old Tim came about two hours late for his appointment. He said that an elephant had sat on a car in front of his bus. Nothing could move in the street for an hour. 13-year-old Rachel Stuart rang yesterday. This is how that conversation went: "Hello, Doctor Bowden's surgery. How can I help you?" "This is Mrs Stuart. I'm afraid my daughter Rachel cannot come for her appointment this morning. She has to stay at home as she has lost her voice," "I see. And who am I speaking to?" "My mother." Choose the best answer to complete the sentences. 1. Roland_________ A. phoned the dentist at 11 o'clock B. phoned the dentist at 12 o'clock C. phoned the doctor at 12 o'clock D. arrived at the dentist at 12 o'clock
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【简答题】B If you thought pilots dimmed (调暗) the lights before takeoff to give you some shuteye, think again. Believe it or not, the dim lighting could actually help save your life in case of a plane emergency...
【单选题】常见金属晶体的缺陷包括 、 和面缺陷。
A.
位错缺陷、晶界缺陷
B.
点缺陷、线缺陷
C.
空位缺陷、位错缺陷
【多选题】维持子宫前倾前屈位的主要韧带是()
A.
子宫阔韧带
B.
骶子宫韧带
C.
子宫圆韧带
D.
子宫主韧带
E.
子宫悬韧带
【判断题】集装箱轮胎吊的起升机构可以和大车机构一块动作。
A.
正确
B.
错误
【简答题】实际金属的晶体缺陷包括( )、( )、( )。
【判断题】金属的实际晶体结构存在晶体缺陷,包括点缺陷、线缺陷、面缺陷。
A.
正确
B.
错误
【判断题】金属材料的晶体面缺陷主要包括晶界、亚晶界、相界面、表面、空洞、夹杂、裂纹等。
A.
正确
B.
错误
【单选题】下列关于金属晶体结构的说法错误的是()。
A.
点缺陷常见的形式有空位、间隙原子、置换原子
B.
晶体中的线缺陷就是各种类型的位错
C.
面缺陷只包括晶体的外表面
D.
在金属机合金中,主要是金属键
【简答题】金属晶体的缺陷包括 、 、 。
【判断题】金属晶体的缺陷包括 点、线、面。
A.
正确
B.
错误
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