尾缆的作用是：（）
Ⅰ、防止船舶前移Ⅱ、防止船尾向外偏转Ⅲ、防止船舶后移
A.Ⅰ
B.Ⅰ、Ⅱ
C.Ⅰ、Ⅱ、Ⅲ
D.Ⅱ、Ⅲ
参考答案：B
后牙固定桥咬合较紧，第二磨牙固位体可选择
A．3/4冠B．金属烤瓷全冠C．铸造开面冠D．塑料全冠E．铸造金属全冠
The form cannot be signed by anyone yourself.
A．rather than
B．other than
C．more than
D．better than
