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划线时涂料只有涂得较厚，才能保证线条清晰。()

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Branford reef is ().

A hard sand shoal marked with a light
B. Completely submerged at all stages of the tide
C. Surrounded by rocks awash at low water spring tides
D. A small，low，sandy islet surrounded by shoal water

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划线时涂料只有涂得较厚，才能保证线条清晰。()

Branford reef is ().

H7/n6的配合类型为间隙配合。()

划线的借料就是将工件的加工余量进行调整和恰当分配。()

划线的作用之是确定工件的加工余量.使机械加工有明显的加工界限和尺寸界限。()