题目内容

Which president first cstablished the date of Thanksgiving as a national cclebration?

A. Jefferson.
B. Adams.
C. Lincoln.
D. Wilson.

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Which president moved the date of Thanksgiving twice?

A. Lincoln.
B. Roosevelt.
C. D.Roosevelt.
D. Eisenhower.

截交线即为（）。

平面截切平面立体，采用棱线法求截交线即为求（）

截交线的形状取决于（）和（）