When the competitive market is using its resources efficiently, the
A.total amount of consumer surplus is maximized.
B.sum of the total amount of consumer surplus plus the total amount of producer surplus equals zero.
C.total amount of producer surplus is maximized.
D.sum of the total amount of consumer surplus plus the total amount of producer surplus is maximized.
查看答案
Which of the following correctly defines utilitarianism?
A.The difference between what a consumer is willing to pay and what actually has to be paid.
B.Equality will not result in efficient outcomes.
C.Cost will increase if production increases.
D.Society should strive to achieve the greatest good for the greatest number.
When a market is in equilibrium,
A.the supply curve has the same slope as the demand curve.
B.there is no shortage and no surplus at the equilibrium price.
C.the number of buyers is exactly equal to the number of sellers.
D.everyone has all they want of the commodity in question.
当键连接强度不足时可采用双键，使用两个普通平键时要求两键布置。
A. 在同一直线上
B. 相隔90°~120°
C. 相隔180°
D. 相隔120°~130°
普通平键联接的承载能力，通常是取决于_________。
A. 轮毂的挤压强度
B. 键的剪切强度
C. 键的挤压强度
D. 键连接工作表面的挤压强度
微信支付 
支付宝支付