Nelson曾提出以<img src="/Image1/41/416d70c5ce8bf1e24cd865a81ac5ece8.jpg" />力比值决定基牙数量，其关系是（）<br>A:基牙<img src="/Image1/41/416d70c5ce8bf1e24cd865a81ac5ece8.jpg" />力比值总和×2≥基牙及缺失牙<img src="/Image1/41/416d70c5ce8bf1e24cd865a81ac5ece8.jpg" />力比值总和<br>B:基牙<img src="/Image1/41/416d70c5ce8bf1e24cd865a81ac5ece8.jpg" />力比值总和×2=基牙及缺失牙<img src="/Image1/41/416d70c5ce8bf1e24cd865a81ac5ece8.jpg" />力比值总和<br>C:基牙<img src="/Image1/41/416d70c5ce8bf1e24cd865a81ac5ece8.jpg" />力比值总和×2＜基牙及缺失牙<img src="/Image1/41/416d70c5ce8bf1e24cd865a81ac5ece8.jpg" />力比值总和<br>D:基牙<img src="/Image1/41/416d70c5ce8bf1e24cd865a81ac5ece8.jpg" />力比值＞缺失牙<img src="/Image1/41/416d70c5ce8bf1e24cd865a81ac5ece8.jpg" />力比值<br>E:基牙<img src="/Image1/41/416d70c5ce8bf1e24cd865a81ac5ece8.jpg" />力比值＝缺失牙胎力比值