使用软连接牵引装置时,牵引车与被牵引车之间的距离应为()m。
A. 4~10
B. 6~15
C. 4~20
D. 10~20
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中国共产党的最高理想和最终目标是（）。
A. 实现共产主义
B. 建设中国特色社会主义
C. 全面建成小康社会
The difference in production outcomes between monopolistic firms and purely competitive firms is best explained by the fact that:
A. the profit maximizing output level for monopolists occurs at lower levels of production than for purely competitive firms
B. monopolists maximize profits by setting output such that marginal revenue exceeds marginal cost
C. monopolists maximize profits by setting output such that marginal revenue is maximized
Consider a market where quantity demanded = 1,500 - 3 x price, and quantity supplied = 2,000 - 5 x price. With respect to equilibrium price and quantity, there is:
A. no market equilibrium.
B. a stable market equilibrium.
C. an unstable market equilibrium.
For a firm in perfect competition, the profit maximizing output is 200 tons at a price of
A. marginal product per unit of labor is 1/3 ton.
B. marginal revenue product of capital is equal to the price of a unit of capital.
C. ratio of the marginal output per labor unit to labor units employed is at a maximum.
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