问题
单项选择题
义齿基托折断修理时最常采用的是
A．自凝塑料
B．热凝塑料
C．磷酸锌粘固粉
D．玻璃离子粘固剂
E．环氧树脂粘固粉
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
义齿基托折断修理时最常采用的是
A．自凝塑料
B．热凝塑料
C．磷酸锌粘固粉
D．玻璃离子粘固剂
E．环氧树脂粘固粉
参考答案：A
| 阅读理解。 | |
| Forests are large pieces of land covered with big trees. They are found all over the world, especially in places where there is enough sunshine and much rainfall. 1______ To build a house, we need wood for doors and windows. Beautiful chairs and tables are also made of wood. Teak (柚木) wood is very useful for ship-building. It is used for all parts of a ship where wood and metal come in contact (接触), for it has a kind of oil to keep metal away from rust (铁锈). 2______ For this, teak wood is an important railway building material. Forests are no less important than useful. They are the home of wild animals. Without them, those animals would run among the places where we live and work. 3______ Forests are helpful to weather, too. When it is very hot, they can be a good place for people to stay away from the sun. In winter, they can keep us from the cold. Forests can also stop the land from being washed away by heavy rain for the trees hold the soil together. 4______
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| 5. What's the best title for the passage? | |
| A. Forests and Animals B. Forests are all Over the World C. Forests are Important D. We never Cut Down the Trees |