当年播种，在当年开花结实，冬季枯死的花卉是（）。 A.菊花 B.大丽花 C.鸡冠花

Radio interferometry is a technique for studying details of celestial objects that combines signals intercepted by widely spaced radio telescopes. This technique requires ultraprecise timing, exact knowledge of the locations of the telescopes, and sophisticated computer programs. The successful interferometric linking of an Earth-based radio telescope with a radio telescope on an orbiting satellite was therefore a significant technological accomplishment.
Which of the following can be correctly inferred from the statements above

A．Special care was taken in the launching of the satellite so the calculations of its orbit would be facilitated.

B．The signals received on the satellite are per than those received by a terrestrial telescope.

C．The resolution of detail achieved by the satellite-Earth interferometer system is inferior to that achieved by exclusively terrestrial systems.

D．The computer programs required for making use of the signals received by the satellite required a long time for development.

E．(E) The location of an orbiting satellite relative to locations on Earth can be well enough known for interferometric purposes.

2012年11月中旬，某旅行社总经理召集该社的市场、销售、计调、财务的负责人开会，研究下一年度的经营计划，并要求他们提出相应的经营法案。2012年12月初，该社相关部门向旅行社总经理提出了5套经营方案。该社总经理再次召开各部门负责人开会，研究这些方案，并对各个方案分别做了敏感度分析，以评价各个经营方案的风险，并选取最优的经营方案。

如果2013年旅游市场形势看好与形势看差的概率相等，在5套经营方案中，期望效益超过250万元的是（）.

A．A经营方案

B．B经营方案

C．C经营方案

D．D经营方案

E．E经营方案

电子商务有那些最基本的形式，电子商务对于企业的价值表现在那些方面？

皮片移植术后，皮片恢复知觉的时间约在

A．术后1～2周

B．术后48～72小时

C．术后1～2个月

D．术后5～6个月

E．术后2年以上

在建工程作业场所的临时疏散通道应与在建工程结构施工同步设置（）。

A.应采用不燃、难燃材料建造

B.耐火极限不应低于0.5h

C.耐火极限不应低于3.0h

D.临时疏散通道应设置明显的疏散指示标志

E.临时疏散通道应设置照明设施