题目内容

Why did the early settlers come to America? Who were the Pilgrims? Who were the Puritans? What were the features in the colonial period which had influence on later American development?

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经济政策手段

绒毛心(cot villosum)

光纤传输线路（光缆）

在机械制图中尺寸界限应为（）。

A. 粗实线
B. 细实线
C. 虚线
D. 点划线