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问题
填空题
联轴器的键对键槽的配合其两侧应选用(),不允许有间隙;上部间隙应为()毫米。
答案
参考答案:
过渡配合0.2~0.5
选择题
— What is your sister doing now?
— She is packing. She ______ to Hong Kong next week.
A. fly
B. flew
C. was flying
D. is flying
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问答题 论述题
论述代位追偿制度产生的理论基础。
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