根据构件的几何特征将构件分为（）、板、块体、薄壁杆。
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I asked him whether he had done all the work himself ________ whether he had had any assistance.
A. and
B. but
C. nor
D. or
Either Mary ___ Lucy told him to come to see us.
A. or
B. and
C. with
D. nor
Hurry up, ____ we'll be late for the film.
A. and
B. but
C. so
D. or
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