釉质发育不全的临床表现是（） A.釉质表面呈不透明白噩色，并出现深浅不等的带状或窝状

发布时间：2017-08-11 11:33 │ 来源：www.tikuol.com

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问题：

釉质发育不全的临床表现是（）

A.釉质表面呈不透明白噩色，并出现深浅不等的带状或窝状凹陷

B.恒牙在同一时期发育的对称牙上，釉质颜色改变呈白平色或黄褐色

C.全口牙釉质颜色改变

D.牙釉质或牙骨质呈白垩色或黄褐色，探诊有粗糙感

E.牙的窝沟有色素沉着，不弥散，无墨浸状

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未经授权擅自对客户、柜员资料进行修改、增删或在业务用机上进行与业务工作无关的操作，给予哪些处理？

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有人认为转基因生物有可能成为入侵的外来物种，威胁生态系统中其他生物的生存。其依据是[ ]

A．转入的外源基因有可能与感染转基因生物的某些细菌杂交，形成新的病原体

B．转基因植物的抗除草剂基因，有可能通过花粉传播而进入杂草中，使杂草成为超级杂草

C．科学家赋予了转基因生物某些特殊性，增强了它们在该地区生存条件下的竞争能力

D．转基因植物花粉传播的距离有限，只能在种植区以内繁殖

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完形填空。
A young student was one day taking a walk with a professor, who was commonly 1 the students' friend. As they went 2 , they saw lying in the path a pair of old shoes, which they supposed to 3 a poor man who was employed in a field 4 . The student turned to the professor, saying,"Let us play the man 5 : we will hide his shoes, and 6 ourselves behind those bushes, and wait to see his 7 when he cannot find them. " "My young friend," answered the professor, "we should never 8 ourselves at the 9 of the poor. But you are 10 , and may give yourself a much greater 11 by means of the poor man. Put a coin into each shoe, and then we will hide ourselves and 12 how the discovery affects him. " The student did so, and they both placed themselves behind the bushes. The poor man soon finished his work and 13 the field to the path 14 he had left his coat and shoes. While 15 his coat he slipped his foot into one of his shoes; but feeling something 16 , he stooped down (弯下腰) to feel 17 it was, and found the coin. Astonishment and wonder were seen upon his countenance(面部表情). He then looked around him on all sides, but no person was to be seen. He now put the money into his pocket, and proceeded to put on the other shoe; but his surprise was 18 on finding the other coin. He fell upon his knees, looked up to heaven and uttered aloud a fervent (热烈的) thanksgiving, in which he 19 his wife, sick and helpless, and his children without brea d. The student stood there 20 affected, and his eyes filled with tears.
( )1. A. held ( )2. A. along ( )3. A. get to ( )4. A. close by ( )5. A. a game ( )6. A. hide ( )7. A. pleasure ( )8. A. make ( )9. A. money ( )10. A. poor ( )11. A. pleasure ( )12. A. notice ( )13. A. came about ( )14. A. where ( )15. A. wearing ( )16. A. soft ( )17. A. what ( )18. A. increased ( )19. A. spoke of ( )20. A. heavily	B. kept B. on B. stick to B. far B. a trick B. have B. sorrow B. treat B. expense B. kind B. money B. watch B. came across B. on which B. dressing B. terrible B. how B. put B. told of B. slightly	C. named C. over C. belong to C. faraway C. a joke C. let C. disappointment C. amuse C. value C. honest C. thought C. observe C. came into C. there C. putting on C. strange C. whether C. doubled C. talked about C. easily	D. called D. back D. object to D. near D. a word D. make D. anxiety D. laugh D. pay D. rich D. good D. see D. came by D. which D. changing D. hard D. why D. reduced D. said about D. deeply

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A．1年
B．2年
C．3年
D．5年

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常用密封件截面形状有（）。

A、O形

B、U形

C、Y形

D、V形

E、X形

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