下列与基托折裂无关的是（）。
A.基托太薄
B.未作加强或加强不当
C.基托材料强度差
D.基托的表面光洁度
E.基托在硬腭处有支点
参考答案：D
B、尽可能避免因平面镜成像造成不安全因素
C、为了造型美观
D、防止挡风玻璃震碎
With their help, we finished the work with _______ people and ______ time.
A．fewer; less
B．less; less
C．less; fewer
D．fewer; fewer
