问题 单项选择题 B型题

上颌部外伤后摇动左上中切牙时,双侧的尖牙都活动()

A.上颌骨骨折

B.下颌骨骨折

C.牙槽骨骨折

D.颧弓骨折

E.颧骨骨折

答案

参考答案:C

解析:颌面部各类骨折的特点是:摇动一个牙邻近多个牙一起活动时是牙槽骨骨折的特征;上颌骨骨折的LefortⅡ、Ⅲ型常伴有脑脊液漏;下颌骨骨折时易造成下牙槽神经损伤;颧弓骨折内陷移位压迫颞肌、咬肌,并可阻碍冠突运动引起张口受限;而颧骨构成眼眶的外侧壁,它的骨折移位可致眼球的外展肌受损,或眼下斜肌嵌入骨折线中,使眼球运动受限造成复视。

单项选择题

In the United States, the first day nursery was opened in 1854. Nurseries were established in various areas during the (91) half of the 19th century; most of (92) were charitable. Both in Europe and in the U. S. , the day-nursery movement received great (93) during the First World War, when (94) of manpower caused the industrial employment of unprecedented numbers of women. In some European countries nurseries were established (95) in munitions (军火)plants, under direct government sponsorship. (96) the number of nurseries in the U.S. also rose (97) , this rise was accomplished without government aid of any kind. During the years following the First World War, (98) , Federal, State, and local governments gradually began to exercise a measure of control (99) the day nurseries by (100) them and by inspecting and regulating the conditions within the nurseries.
The (101) of the Second World War was quickly followed by an increase in the number of day nurseries in almost all countries, as women were (102) called upon to replace men in the factories. On this (103) the U. S. government immediately came to the support of the nursery schools, (104) $6,000,000 in July, 1942, for a nursery school program for the children of working mothers. Many States and local communities (105) this Federal aid. By the end of the war, in August, 1945, more than 100,000 children were being cared (106) in day-care centers receiving Federal (107) Soon afterward, the Federal government (108) cut down its expenditures for this purpose and later (109) them, causing a sharp drop in the number of nursery schools in operation. However, the expectation that most employed mothers would leave their (110) at the end of the war was only partly fulfilled.

A.regulating

B.summoning

C.allocating

D.transferring

单项选择题