2023届衡水金卷先享题分科综合卷·全国II卷A·理数(一)

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M:David Evans decided to change places with his daughter Victoria.He went to school and sat through a full dayof lessons.⑦At first he was tense as he was44 and it was a long time since he was at school.But theteachers and students made him very welcome.That day Victoria’s father had 9 different classes.He did worse inscience and math as he didn’t remember much from his school days.18His answer in English literature wasbrilliant,but he failed in physical training class as he was out of practice.While her father was at school,Victoria,aged 17,stayed at home and did her father’s job in the house.Victoria’s mother is an archeologist andshe was in Egypt at that time,so the father had to do much about the house.19In the morning Victoriacleaned the rooms and typed on the computer one chapter of her father’s latest book.20In the afternoonshe worked in the garden.At four o’clock her father came home and told her about his school life.After dinnerMr.Evans had to do his homework while Victoria read the paper and watched TV.She said,“I think I prefermy own normal day!”

用久了的白炽灯泡内壁会变黑,这一现象中,组成了灯丝的物质的钨发生的物理变化是( )

A.汽化与凝华
B.汽华与凝固
C.升华和凝华
D.升华与凝固

解析:

灯丝是固态钨,在通电后,固体钨升华变为气态钨。气态钨遇到温度较低的灯泡玻璃外壁,放热凝华形成固态钨,附着在玻璃内表面。
故选:C

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