固定义齿的基本类型包括()
A.复合固定桥
B.完全固定桥
C.半固定桥
D.双端固定桥
E.单端固定桥
参考答案:C, D, E
The gas in my car is ______. I must find a gas station to fill it up as soon as possible.
A.trying out
B.letting out
C.running out
D.breaking out
已知∠α是锐角,∠α与∠β互补,∠α与∠γ互余,则∠β-∠γ的值等于( )
A.45°
B.60°
C.90°
D.180°