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问题 单项选择题 A1/A2型题

依据骨折的形态分类，对下述骨折的描述中不正确的是（）。

A.嵌入骨折：发生在长管骨干骺端皮质骨和松质骨交界处，骨折后皮质骨嵌插入松质骨内，可发生在股骨颈和肱骨外科颈等处；裂缝骨折：如长骨干或颅骨伤后可有骨折线，但未通过全部骨质

B.横形、斜形及螺旋形骨折：多发生在骨干部；粉碎性骨折：骨碎裂成两块以上，骨折线呈T形又称T形骨折，呈Y形又称Y形骨折

C.新鲜骨折：新发生的骨折和尚未充分地纤维连接，还可能进行复位者，2～3周以内的骨折

D.压缩骨折：松质骨因压缩而变形如椎骨和跟骨；星状骨折：多因暴力直接着力于骨面所致如颅骨及髌骨；凹陷骨折：如颅骨因外力使之发生部分凹陷

E.青枝骨折：多发生在小儿，骨质部分断裂，骨膜及部分骨质未断；骨骺分离：通过骨骺的骨折，骨骺的断面可带有数量不等的骨组织是骨折的一种

答案

参考答案：C

单项选择题

B

The largest earthquake (magnitude里氏9.5 ) of the 20th century happened on May 22, 1960 off the coast of South Central Chile.

It generated (生成) one of the most destructive Pacific-wide tsunamis (海啸). Near the

generating area, both the earthquake and the tsunami were very much destructive, particularly in the coastal area from Concepcion to the south end of Isla Chiloe. The largest tsunami damage occurred at Isla Chiloe-the coastal area closest to the epicenter(震中). Huge tsunami waves measuring as high as 25 meters arrived within 10 to 15 minutes after the earthquake, killing at least two hundred people, sinking all the boats, and flooding half a kilometer inland.

There was large damage and loss of life at Concepcion, Chile’s top industrial city. Near the city of Valdivia, the earthquake and following aftershocks generated landslides which killed 18 people. At the port city of Valparaiso, a city of 200,000, many buildings collapsed. A total of 130,000 houses were destroyed--one in every three in the earthquake zone and nearly 2,000,000 people were left homeless.

Total damage losses, including to agriculture and to industry, were estimated(估计) to be over a half billion dollars. The total number of deaths related with both the tsunami and the earthquake was never found accurately for the region. Estimates of deaths reached between 490 to 5,7002 with no distinction(差别) as to how many deaths were caused by the earthquake and how many were caused by the tsunami. However, it is believed that most of the deaths in Chile were caused by the tsunami.

What is generally thought the main cause of deaths in Chile().

A. Landslides.

B. The tsunami.

C. Aftershocks.

D. The magnitude 9.5 earthquake.
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单项选择题

某龈沟位点探诊深度为5mm，结合上皮位于釉牙骨质界，其附着丧失为（）

A.2mm

B.5mm

C.7mm

D.3mm

E.没有附着丧失
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