问题
单项选择题
继发龋的发生与下列哪项无关
A．充填时操作不当
B．腐质未去干净
C．窝洞制备不当
D．修复的材料调制不当
E．没有用窝洞消毒剂
答案
参考答案：E
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继发龋的发生与下列哪项无关
A．充填时操作不当
B．腐质未去干净
C．窝洞制备不当
D．修复的材料调制不当
E．没有用窝洞消毒剂
参考答案：E
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| Every year many people get hurt or die in traffic accidents. People make traffic 1 for some reasons, so we must obey them. Different countries have different traffic rules. In China, all the cars and buses keep on the 2 of the road. 3 we cross the road, we must 4 and look at both sides (first left then right). But in England, the traffic is on the left. When you cross the road, you should look 5 first or you may be in an accident. People have to obey many traffic rules. You must walk 6 the sidewalk. If you like riding a bike, don't ride in the middle of the road 7 run through red traffic lights (闯红灯). When you ride a bike with a friend, 8 look around and talk. When you drive, you must not drive too fast and you should pay attention to (注意) the traffic 9 . For example (例如), when you see, you mustn't make a U-turn. It's good 10 children and old people to cross the road. Remember to (记住) think about others. | ||||
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