【简答题】V带传动在运行时,受到了拉应力、离心应力和弯曲应力,最大应力发生在_____________。
【单选题】The objective of this book is to introduce engineering and science students to the interdisciplinary study of environmental problems: their causes, why they are of concern, and how we can control them...
C.
environmental problems
【单选题】When factor supply is fixed and quantity of the factor is graphed on the horizontal axis while factor price is graphed on the vertical axis, the factor:
A.
supply curve is horizontal.
B.
supply curve is vertical.
C.
supply curve slopes up to the right.
D.
demand curve slopes up to the right.
【单选题】耳前嚼肌区刀砍伤经清创后局部迅速肿大,有波动感、穿刺有清亮液体最可能的原因是:
【单选题】Which of the following factor is not the determinant of price elasticity of demand
A.
how to classify the necessities and luxuries
B.
the range of the market
【单选题】Which of the following is not a factor that affects price elasticity of demand?
A.
The availability of substitutes
B.
The necessity of the product or service
C.
The duration of the price change
D.
The change in the number of units demanded
【单选题】According to the factor-price-equalization theorem, free trade equalizes:
A.
Product prices as well as the prices of individual factors of production between two countries.
B.
Product prices between two countries but not the prices of individual factors of production.
C.
Product prices between two countries and factor prices within each country but not between countries.
D.
Product prices and factor prices within each country but not between countries.
【单选题】()是中国历史上第一个朝代,也是中国历史上最早的奴隶制国家。