相同迎角,飞行速度增大一倍,阻力增加为原来的()
A.一倍
B.二倍
C.四倍
参考答案:C
— Have you seen the film Under the Hawhorn Tree?
—Of course, I have. It was in our village _____ it was made.
A.that
B.where
C.when
D.which
某患者,缺失,左下45间有约1.5mm间隙缺失,基牙条件良好,防止义齿前后翘动最有利的措施是()
A.扩大基托面积
B.设计舌支托
C.设计间接固位体
D.减少牙尖斜度
E.设计平衡卡环