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Good Table Manners Manners play an important part in making a favorable impression at the dinner table. Here are some general rules: Napkin (餐巾) use The meal begins when the host unfolds his or her napkin. This is your signal to do the same, so place your napkin on your lap. Unfold it completely if it is a small napkin, or in half, lengthwise (纵向地), if it is a large dinner napkin. If you need to leave the table during the meal, place your napkin on your chair as a signal to your server that you will be returning. Once the meal is over, place your napkin neatly on the table to the right of your dinner plate. Do not refold it. Use a napkin only for your mouth. Never use it for your nose, face or forehead. Use of utensils (餐具) A. your forehead B. your mouth C. your nose D. your face [多项选择]关于氟牙症的叙述正确的是（）。
A. 饮水中氟含量过高是主要病因 B. 饮水中氟量1ppm时既能防龋又不产生氟牙症 C. 高氟可导致釉基质合成障碍 D. 牙齿表面有窝状缺陷，着色 E. 根本的预防措施为改良水源 [单项选择]输卵管结扎术的目的是（）
A. 抑制排卵 B. 阻止精子与卵子相遇 C. 抑制性激素分泌 D. 改变女性内分泌系统的正常功能 E. 改变女性特征 [单选题]室内明敷主干线的距地高度不得小手( )。
A. 1. 5m B. 2. 0m C. 2. 5m D. 3. 0m [填空题]BJT放大器中，放大管的β值为常数的条件是在低频条件下（fβ）、（）。
[单项选择]In what way can we make a machine intelligent
A. By making it work in such environments as deserts, oceans or space. B. By working hard for 10 or 20 years. C. By either properly programming it or changing its structure. D. By reproducing it. [判断题]在地下不得采用裸铝导体作为接地体或接地线。
A.正确 B.错误 我来回答: 提交
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