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
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