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【简答题】
固接导动是指截面线在沿导动线移动过程中始终保持最初与导动线之间固定的空间夹角关系不变()的曲面
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【单选题】She is grown up. She is ______ .
A.
very old
B.
an adolescent
C.
a teenage
D.
an adult
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