题目内容
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
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有抗渗要求的混凝土中，优先选用何种水泥
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
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.
强制认证包括两个环节：一是型式试验，二是工厂审查。
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