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根据顶杆复位方式的不同，模具可分为（）模具和（）模具两种类型，当模具表面粘铝时，需用（）按照（）和（）轻轻碚光

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considered（）“the true father of our national literature ”.

A. Bret Harte
B. Mark Twain
C. Washington Irving
D. Walt Whitman

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Unlike his contemporaries in the early 20th century,（）did not break up with the poetic tradition nor made any experiment on form.

A. Walt Whitman
B. Robert Frost
C. Ezra Pound

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Which of the following statements is NOT true of Emily Dickinson and her poetry（）

A. She remained unmarried all her life
B. She wrote,1,775 poems,and most of them were published during her life time.
C. Her poems have no titles,hence are always quoted by their first lines.
D. Her limited private world has never confined the limitless power of her creativity and imagination.

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误差传播定律是指什么？

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