下列化学元素是碳素钢中有害杂质的是()。
A.磷
B.硫
C.锰
D.氧
参考答案:A, B, D
下列化学元素是碳素钢中有害杂质的是()。
A.磷
B.硫
C.锰
D.氧
参考答案:A, B, D
读一读,选出正确答案。 |
Ann: Hello, where are you going? Bob: To the park to fly a kite. Ann: How's the weather today? Bob: Not sunny. But it is windy. Just right for flyinq kites. Would vou like to play with me? Ann: Great! Let's go. |
l. Where does Bob want to go? |
[ ] |
A. Home. B. School. C. Park. |
2. What does Bob want to do? |
[ ] |
A. To buy a kite. B. To fly a kite. C. To see a friend. |
3. How's the weather? |
[ ] |
A. It's rainy. B. It's sunny. C. It's windy. |