问题
单项选择题
临床常用的牙本质表面处理剂是
A．30%磷酸
B．30%枸橼酸
C．30%聚丙烯酸
D．0.5mol/L依地酸(EDT
E．30%马来酸
答案
参考答案：D
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临床常用的牙本质表面处理剂是
A．30%磷酸
B．30%枸橼酸
C．30%聚丙烯酸
D．0.5mol/L依地酸(EDT
E．30%马来酸
参考答案：D
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| One day, a boy was selling things from door to door, but he sold nothing. He had 1 money with him and was very hungry, so he wasted to ask for some 2 from someone. Then a beautiful woman opened the door. The boy was so shy that he didn't ask for food, 3 just asked for some water. The woman could see he was 4 , so she brought him a glass of milk. He 5 it and asked her,"How much should I give you?" "No, you don't need to 6 me anything," she answered."Mother told me never to get anything 7 a kindness." The boy said "Thank you!" and left that house 8 He felt a kind of warmth (温暖). After many 9 , the woman was seriously ill. The doctors there could do nothing. In the end, she went to the best hospital in the big city. Luckily, the 10 doctor, Howard Kelly, was there. When he knew where she came from, he remembered something. So he went to the woman's 11 He looked at the woman and 12 who she was at last. From that day on, he started to do his best to save her life. A few weeks later, the woman got 13 The Dr. Kelly wrote something on the bill and gave it to the woman. The woman thought that it would 14 her lots of money. But when she looked at the bill, there were only some words on it. She read the words "The cost-the warmth of a glass of 15 ." | |||
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