一、浇筑厚大体积的混凝土,在常用品种的水泥中,应优先选用哪些品种?可以使用哪些品种?不得使用哪些品种? (10分)二、简要说明普通混凝土配合比设计的步骤。 (10分)三、用水泥胶结料配制耐热混凝土时,最好使用什么水泥?粗、细骨料各用哪些材料? (10分) First, pouring thick concrete, in the commonly used varieties of cement, which varieties should be preferred? Which species can be used? Which species should not be used? (10 points) 2. Briefly explain the steps for designing the proportion of ordinary concrete. (10 points) 3. What kind of cement should be used when heat-resistant concrete is prepared with cement binder? Which materials are used for coarse and fine aggregate? (10 points)