【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】The branch of economics that is concerned with the overall performance of the economy is called ( ) .
B.
contemporary economics
【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
【单选题】反映直接作用于感觉器官的客观事物的个别属性的心理过程是
【判断题】器皿清洗的目的是防止油污、重金属离子、酸碱等有害物质残留在器皿内,影响培养物生长。
【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()
【判断题】器皿清洗的目的是防止油污、重金属离子、酸碱等有害物质残留在器皿内,影响培养物生长。
【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( )
【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?