问题
单项选择题 共用题干题
错畸形主动治疗结束以后，为防止复发，保持已经取得的矫治效果，需要用保持器。保持器就是防止复发的机械性保持装置
常用的Hawley保持器有一个标准型和几个改良型（）。
A.1个
B.2个
C.3个
D.4个
E.5个
答案
参考答案：C
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错畸形主动治疗结束以后，为防止复发，保持已经取得的矫治效果，需要用保持器。保持器就是防止复发的机械性保持装置
常用的Hawley保持器有一个标准型和几个改良型（）。
A.1个
B.2个
C.3个
D.4个
E.5个
参考答案：C
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| When I come across a good article while reading newspapers, I often want to cut and keep it. But just as I am about to do so, I find the article on the 1 side is more interesting. It may be a discussion of the way to 2 in good health, or 3 about how to behave and conduct oneself in society. If I cut the front article, the opposite one is likely to 4 damage, leaving out half of it or keeping the text 5 the title. Therefore, the scissors (剪刀) would 6 before they start, 7 halfway done when I find out the 8 result. Sometimes two things are to be done at the same time, both worth your 9 . You can only take up one of them; the other has to wait to be 10 up. But you know the future is unpredictable (不可预测的)-the changed situation may not allow you to do what is left 11 . Thus you are 12 in a difficult position and feel sad. How come that nice chances and brilliant 13 should gather around all at once? It may happen that your life 14 greatly on your preference of one choice to the other. In fact that is what 15 is like: we are often 16 with the two opposite sides of the thing which are both desirable like a newspaper cutting. It often occurs that our attention is drawn to one thing only 17 we get into another. The 18 may be more important than the latter and give rise to a divided mind. I 19 remember a philosopher's remarks that "When one door shuts, another opens in life". So a casual (随意的) 20 may not be a bad one. | ||||
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