What does the writer think of her maths teacher?
A. She taught the writer an important lesson.
B. She valued the intelligence of her students.
C. She was the best teacher the writer ever had.
D. She was the worst teacher the writer ever had.
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夹具夹头零件加工中，进行了几次装夹？
A. 1
B. 2
C. 3
D. 4
夹具夹头零件加工中，下列毛坯尺寸最为合理的是：
A. 30mm*30mm*60mm
B. 30mm*30mm*70mm
C. 20mm*20mm*60mm
D. 30mm*50mm*60mm
在夹具夹头零件第二次装夹时，为避免损伤夹头侧壁，夹持位置应为夹头侧壁面相互平行的部分，千万不能夹持带圆弧的轮廓面。
A. 对
B. 错
夹具夹头零件第三次装夹时，要将工件竖直装夹，要确保工件处于垂直状态，千万不能侧偏，否则无法保证对称度要求。
A. 对
B. 错
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