X、Y是第2或第3周期中的两种元素，它们可形成离子化合物XmYn，且离子均有稀有

Delicate Arch

Delicate Arch can be found in Arches National Park in Utah, USA. The arch stands alone at a height of 52 feet and is considered one of Utah's most important landmarks. In 2002, the Olympic torch passed through this arch to mark the beginning of the winter games.

Wave Rock

This 15-meter high and 110-meter long impressive natural rock formation is located in Western Australia. It looks like a large, smooth wave ready to break. Algae(海藻）grow on the surface of Wave Rock.

The Wave

The Wave is located on the slopes of the Coyote Buttes, Arizona, USA. This incredible formation can be reached by hiking approximately 4.8 kilometers, making the round trip to and from The Wave a nearly 9.7-kilometer hike that climbs about 107 meters in altitude.

James Bond Island

James Bond Island can be found in Aohang-Nga National Park in Thailand. The needle-shaped rock formation was named James Bond Island because it was featured in a 1974 Bond film The Man with the Golden Gun.

Devil's Tower

The formation known as Devil's Tower can be found in Wyoming, USA. Also known as Bear Tower, the rock formation is actually the neck of a volcano. It rises 386 meters above the surrounding land and the top of it is 1.558 meters above sea level.

The Giant's Causeway

The Giant's Causeway is located in Northern Ireland and has a series of over 40,000 columns made of basalt(玄武岩). Each column is connected and the formation is believed to be a result of volcanic ash. Believe it or not, when this formation was first discovered, scientists argued as to how it was formed. Some thought it was natural, others thought it was manmade, and some thought that perhaps it had been created by a giant!

Bryce Canyon National Park

One of the most impressive rock formations in the world is the Bryce Canyon in Utah, USA. It is a national park and despite its name, it is not actually a canyon, but rather a giant natural amphitheater( 圆形竞技场）created by erosion.

Pierce Rock

This rock formation is one of the largest natural arches in the world. This natural arch named Pierce Rock is an island in the Gulf of Saint Lawrence, Canada. It is 433 meters long,90 meters wide, and 88 meters at its highest point.

55. Which of the following rock formations is located in Asia?

A. Wave Rock.                            B. James Bond Island

C. The Giant's Causeway.                    D. Pierce Rock.

56. Which of the following rock formations is related to a volcano?

A. The Wave                            B. Devil's Tower.

C. Bryce Canyon National park.             D. Pierce Rock.

57. Which of the following words can best describe the rock formations?

A. Impressive.                               B. Unexpected.

C. Surprising.                                D. Unexceptional.

58. According to the passage, the scientists once argued with regard to__________at first.

A. why Pierce Rock was so featured

B. when Bryce Canyon National park came into being

C. what on earth these formations are connected with

D. how the Giant's Causeway was formed

下列X线钡剂灌肠检查所见不符合溃疡性结肠炎的是（）

A.病变轻微者可以正常

B.肠壁呈现毛刺状或是锯齿状

C.结肠袋消失

D.可见圆形或是卵圆形充盈缺损

E.可呈现跳跃征

影响供应商在行业中议价能力的冈素有( )。

A．产品差异化程度

B．产品重要性

C．后向一体化的可能性

D．产品在市场上有替代品

某桥梁工程施工合同，工程开工后第八个月，施工承包商发现施工图纸有误，遂向监理工程师汇报了这一情况，经监理工程师审核后，确实存在错误，经建设单位同意后，监理工程师责成承包单位对原施工图提供变更相应的图纸和说明。因施工图设计变更，导致施工单位停工待图，施工单位因停工待图导致工期拖延和费用增加，向原施工图设计单位提出索赔。
[问题]

就停工待图事件，施工单位提出索赔和监理工程师答复的程序是如何规定的

负债管理理论是以( )为经营重点来保证流动性、盈利性的经营管理理论。

A．负债

B．资产负债

C．协调资产

D．资产业务