金属材料的力学性能是指金属在外力的作用下所表现出来的弹性、塑性、韧性、强度、硬度等各种特性。
参考答案:对
阅读理解。
This is my room.The books are in the bookcase.The picture of my family is on the wall. My backpack
is on the chair. And I have a baseball. It's on the floor, between the bookcase and the desk. A computer is on the desk. Some CDs are behind(在……后面) the computer. And I have a cat. It's on my bed.
根据短文内容回答下列问题:
1.Does the writer(作者) have a room?
2.Where are the books?
3.Is the photo of the writer's family on the wall?
4. Does the writer have a sofa in his room?
5.Where is the computer ?
我国应完善留学()和()建设,为留学人才提供良好的创新、创业环境。
A.创新基地,高科技园区
B.创业园,应用技术产区
C.创业园,高科技园区
D.创新基地,创业园区