【单选题】Pure monopoly is characterized by
A.
many firms that produce a homogeneous product
B.
many firms that produce slightly different products that are close substitutes
C.
such a small number of firms that each must figure out how the others will respond to its own actions
D.
one firm, with no competitors, that produces a product with no close substitutes
【单选题】Pure monopoly:
A.
is characterized by a single supplier.
B.
is a market structure in which no close substitute products are available.
C.
exists when entry and survival of potential competitors is extremely unlikely.
D.
is characterized by all of the above.
【判断题】在向遇险航空器事故的幸存者提供援助时,缔约国可以对本国公民提供优先救护待遇
【判断题】住房公积金是按照应发工资的一定比例计算的。
【判断题】在向遇险航空器事故的幸存者提供援助时,缔约国可以对本国公民提供优先救护待遇。
【简答题】运用单基站GPS RTK的放样方法的流程如何?
【单选题】一个螺丝钉的重量是随机变量 X ,其期望值是 1 两,标准差是 0.1 两。利用同分布中心极限定理计算 100 个同型号螺丝钉的重量超过 102 两的概率,即 ( )。
【单选题】驱动电机型号由()代号、尺寸规格代号、信号反馈元件代号、冷却方式代号、预留代号五部分组成。