Nelson曾提出以力比值决定基牙数量，其关系是（）<br>A:基牙<img src="/Image1/20/209d039037793a279d79976fa8299152.jpg" />力比值总和的两倍≥基牙及缺失牙<img src="/Image1/20/209d039037793a279d79976fa8299152.jpg" />力比值总和<br>B:基牙<img src="/Image1/20/209d039037793a279d79976fa8299152.jpg" />力比值总和的两倍＝基牙及缺失牙<img src="/Image1/20/209d039037793a279d79976fa8299152.jpg" />力比值总和<br>C:基牙力<img src="/Image1/20/209d039037793a279d79976fa8299152.jpg" />力比值总和的两倍<基牙及缺失牙<img src="/Image1/20/209d039037793a279d79976fa8299152.jpg" />力比值总和<br>D:基牙<img src="/Image1/20/209d039037793a279d79976fa8299152.jpg" />力比值>缺失牙力比值<br>E:基牙<img src="/Image1/20/209d039037793a279d79976fa8299152.jpg" />力比值=缺失牙力比值