对螺纹旋向的判断是：顺时针方向旋入时，则该螺纹是右螺纹。
A. 对
B. 错
[音频]to an unusual degree; very
[音频]a set of figures that show how many people watch or listen to a particular television or radio program, used to show how popular a program is
[音频]not likely to take risks; cautious or careful
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