板块地面铺设水泥砂浆结合层时，对水泥有什么要求？
参考答案：
宜采用硅酸盐水泥、普通硅酸盐水泥、矿渣硅酸盐水泥。强度等级不应小于32.5。
何为急性白血病M4型？其亚型如何划分？
用“ if ” 把下列句子连接起来。
1. I will go the park tomorrow. I have time.
2. They stay in the desert. They will see the camels.
3. Tigers are in danger. They attack people.
4. Elephants are thirsty. They go to the river.
5. Giant pandas have no food. They die.
