题目内容

硅酸盐水泥与普通水泥都是常用水泥，在硅酸盐水泥中不含以下哪种成分

A. 硅酸盐水泥熟料
B. 6%~10%混合材料
C. 0~5%石灰石或粒化高炉矿渣
D. 适量石膏磨细制成的水硬性胶疑材料

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在严寒地区处于水位升降范围内的混凝土应优先选以下哪种水泥

A. 矿渣水泥
B. 火山灰水泥
C. 硅酸盐水泥
D. 粉煤灰水泥

有抗渗要求的混凝土中，优先选用何种水泥

A. 矿渣水泥
B. 火山灰水泥
C. 粉煤灰水泥
D. 硅酸盐水泥

为了提高混凝土的抗碳化性能，应该优先选用下列何种水泥

A. .粉煤灰水泥
B. 火山灰水泥
C. 矿渣水泥
D. 硅酸盐水泥

Listen to a VOA education report. Write “T” for the true statements and “F” for the false statements.1. In the United States, the legal age to drink alcohol is 21 — one of the highest in the world.2. All American colleges require all first-year students to take an alcohol prevention and education program, often given online.3. Susan Davis, a university lawyer, says campus police and local police report underage drinking violations to the parents.