【简答题】A.He has a friend who majored in economics. B.He hasn't taken more than one economics course. C.He's been learning economics this year. D.He couldn't make any sense out of his course.
【单选题】关于防冻剂对混凝土垢作用,下面说法不正确的是()
A.
早强组分提高混凝土的早期强度,抵抗水结冰产生的膨胀应力
B.
减少混凝土中的冰含量,并使冰晶粒度细小且均匀分散,减轻对混凝土的破坏应力
C.
防冻组分可降低水的冰点,但水泥在负温下不能继续水化
D.
引气组分引入适量封闭的微气泡,减轻冰胀应力及过冷水迁移产生的应力
【多选题】根据训练课的主要任务和内容,实践中将训练课划分为()
【单选题】The distinction between positive and normative economics ( ) .
A.
is that positive economics applies only to microeconomic problems
B.
is that normative economics applies only to microeconomic problems
C.
explains why economics is not a social science but a natural science
D.
helps us to understand why economists sometimes disagree with one another
【多选题】根据训练课的主要任务和内容,实践中将训练课划分为( )
【多选题】冬期施工为提高混凝土的抗冻性可采取的措施()。
【单选题】If the participants cannot attend a meeting, e.g. they are in another city or country, you can set up a ___ which allows them to take part without actually being present.
【多选题】某框架一剪力墙结构房屋,框架柱横向间距为9m,纵向间距为12m,楼盖为梁板结构。第三层楼板施工时的气温为0℃,没有雨。施工单位制定了完整的施工方案,采用了商品混凝土C30,钢筋现场加工,模板采用木模板,由木工制作好后直接现场拼装。冬期施工为提高混凝土的抗冻性,可采取的措施有()。
【单选题】What is the passage mainly about?
A.
The problems of economics.
B.
How to teach economics?
C.
The economic students' trouble.
D.
How to reform. teaching methods?
【判断题】战术训练以消防技术训练,项目为基础,突出重点,难点项目,从实践需要出发,改革训练内容,制定达标内容和标准。