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【单选题】
三重DES是一种加强了的DES加密算法，它的有效密钥长度是DES算法的( )倍。A.
2
B.
3
C.
4
D.
5
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举一反三
【单选题】听力原文：According to Tom, William lost his job not because he was always sick and usually went to work late, but because he made a big error in last month's accounting and the boss was angry with him. Wi...
A.
he was always sick.
B.
he usually went to work late.
C.
he made a mistake in his work.
D.
he got angry with his boss.
【单选题】螺杆式注塑机的特点是( )。1塑化效率和塑化质量较高; 2注塑压力损失小;3可用于加工热稳定性差的物料;4可以对物料直接着色;5不适合热固性塑料成型;
A.
①②③④
B.
①③④⑤
C.
①②③⑤
D.
①②④⑤
【简答题】Tess was eight years old. Her little brother Andrew was very sick and their parents were completely out of money. She heard Daddy say to her tearful Mother, “Only a miracle can save him now.” Tess too...
【多选题】塑料压注成型的特点是: [ ] 。
A.
塑件质量高，模具磨损小
B.
可以成形结构比较复杂的塑件
C.
塑料的加热熔融是在模具的加热腔内进行
D.
有浇注系统，模具结构较复杂
【简答题】I got sick and tired of hotels.
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