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数感是指什么?

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_______ for the free ticket, I would not have gone to see film so often.

A. If it is not
B. Were it not
C. Had it not been
D. If they were not

钢卷称重的周期约15s()

数学思维是指什么?

金属的塑性和其柔软性的关系是()

A. 金属的塑性和其柔软性之间没有必然连系
B. 塑性提高柔软性增加
C. 塑性降低柔软性增加

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