以仲栽方式进行拉伸试验时,必须采用()测定屈服强度。
A.指针法
B.图示法
C.卸力法
D.没规定
参考答案:B
阅读天地。读短文,选择正确答案。
I have a good friend. It is a white dog. Its name is Lala. It has fur, paws and a tail. It can run fast and play
balls with me, but it can't fly. It likes to eat meat and chicken. It doesn't like to eat rice and fish.
1. Who is my friend?[ ]
A. A cat.
B. A dog.
C. A fish.
2. What colour is it?
A. Black.
B. White.
C. Yellow.
3. How old is it?[ ]
A. Five.
B. One.
C. I don't know.
4. What does it like to eat?[ ]
A. Meat and rice.
B. Meat and fish.
C. Chicken and meat.
5. Can it run fast?[ ]
A. Yes, it can't.
B. No, it can't.
C. Yes, it can.
知天命、知非之年指多少岁?