第14题: [单项选择]全口义齿唇颊侧边缘应是() A. 越厚越好,固位力强 B. 越薄越好,舒适 C. 半圆形略越过唇颊沟 D. 圆形伸展到唇颊沟 E. 圆形离开唇颊沟 参考答案:D
第15题:[单选题]( )S1:Do you have a controllable or fixed pitch propeller? S2: We have a fixed pitch propeller. Q: What type of propeller is it? A.It is a right-hand propeller B.It is a left-hand propeller C.It is a variable pitch propeller D.It is a fixed pitch propeller 参考答案:D