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【多选题】
设计塑件的壁应考虑( )A.
壁厚最小值应以满足塑件在使用时要求的强度和刚度
B.
壁小，流动阻力太大会影响充模
C.
壁大，浪费塑料原料，成型周期延长许多
D.
壁厚均匀一致看上去才美观；
E.
壁厚合理可防止产生分子定向
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