由于氯化物的溶解度大,所以,Cl-是天然水中常见的一种杂质。()
参考答案:对
根据短文内容完成句子
Look at the picture on the blackboard. We can see a house in it. Behind the house there is a hill with many trees. Near
the hill we can see a river. There are three boats in the river. One is blue, the other two are yellow. There are some Young
Pioneers in those boats. Near the house we can see a big tree. Under the tree there is a small bus. It's a white bus.
1. There is a ________ on the ________.
2. ________ is the hill? It's ________ the house.
3. There are a lot of ________ on the hill.
4. Some ________ ________ are in the boats.
5. Is there a ________ ________ bus under the big tree? Yes, there is.
编制材料消耗定额时,材料提耗率可以通( )计算确定。
A.观察法 B.实验法 C.测定法 D.写实记录法