可摘局部义齿的固位体不应对基牙产生（）
A.摩擦力
B.固位力
C.约束力
D.侧向压力
E.向力
参考答案：D
The plane of the Polish president was about to land ______ it snagged(挂) treetops and crashed, ______ the president and 96 others on board.
A．while, killed
B．when, killing
C．and, and killed
D．when, to kill
敬虔运动
