基于维修政策、规程、工具、测试设备等所开展的工作是（）。 A.可靠性作业 B.维修性

关于良性肿瘤的描述，哪项是错误的()

A．表面光滑

B．不发生转移

C．从不危及生命

D．多呈膨胀性生长

E．细胞分化程度较高

D

Any mistake made in the printing of a stamp raises its value. A mistake on one inexpensive postage stamp has made the stamp worth a million and a half times its original (本来的) value. The mistake was made more than a hundred years ago in the British colony (殖民地)of Mauritius, a small island in the Indian Ocean. In 1847 an order for stamps was sent to a London printer—Mauritius was to become the fourth country in the world to issue (发行) stamps.
Before the order was delivered(传达), a party was planned at Mauritius’Government House, and stamps were needed to send out the invitations. A local printer was told to copy the design for the stamps. He printed the words " Post Office " instead of " Post Paid " by mistake on the several hundred stamps that he printed.
Today there are only twenty-six of these misprinted stamps left—fourteen Onepenny Orangereds and twelve Twopenny Blues. Because of the Twopenny Blue’s rareness (稀少) and age, collectors have paid as much as $ 16800 for it.

In 1847 most countries of the world were ______.

A．not yet using stamps

B．collecting valuable stamps

C．buying stamps for Mauritius

D．printing their own stamps

下列关于管理学常识的表述正确的是( )。

A．管理幅度与管理层次之间存在正比例关系

B．“审时度势，相机权变”是权变原理的实质

C．效率性原则是公共危机管理的首要原则

D．行政协调是指行政机关运用各种媒介传递或交流行政信息的过程

物流业的经济核算主要集中在______核算方面。

A．储存

B．装卸和搬运

C．配送

D．运输

现代期货市场交易制度的重要意义在于（）

A.有效控制期货市场风险

B.保障期货市场的平稳运行

C.降低投机者投入成本

D.确保到期日进行实物交割