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研磨绞刀外径，用研磨棒法进行。()

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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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研磨绞刀外径，用研磨棒法进行。()

退火后高温回火称为调质处理。()

螺旋测微器测量精度比游标量具高，常用来测量精度较高的零件。()

划线时涂料只有涂得较厚，才能保证线条清晰。()

Branford reef is ().