阅读理解题目:
Annealing is a way of making metal softer by heating it and then letting it cool very slowly. If metal is heated and then cooled very quickly, for example by dipping (浸) it in water, it will be very hard but also very brittle (脆) that is, it will break easily. Metal that has been annealed is soft but does not break as easily. It is possible to make metal as hard or as soft as is wished, by annealing it. The metal is heated, and allowed to cool slowly for a certain length of time. The longer the heated metal takes to cool slowly, the softer it becomes. Annealing can also be used on other material, such as glass.
1. Annealing can make metal .
A.hardand tough(韧) B. hard but brittle C. soft but tough D. soft and brittle
2. Why do people put hot metal in water?
A.Tomake it hard B. To make it soft. C. To make it cool. D. To make it brittle.
3. In annealing, the required hardness of a metal depend on .
A. the quantity of water used B. the temperature of the metal
C. the softness of the metal D. the timing of the operation
4. As suggested by the text, how can glass be made less brittle?
A. It can be heated an then cooled quickly. B. It can be cooled and then heated slowly.
C. It can be heated and then cooled slowly. D. It can be cooled and then heated quickly.
答案:
1C 2 A 3 D 4 C
正在阅读:
小学三年级优秀作文:洗袜子作文12-04
我的小秘密作文500字11-01
2021年江西萍乡成人高考报名入口(8月28日开通)08-15
2020年的第一场雪作文400字06-13
五年级写事作文:饭桌上的故事作文550字01-12
2018年内蒙古高考大纲:思想政治03-21