A型支承板形状简单，便于制造，但沉头螺钉处清除切屑比较困难，适用于 定位；
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外圆柱面非常容易采用自动定心装置，将其轴线确定在要求的位置上。如常见的 。
A. 三爪自定心卡盘
B. 弹簧夹头
C. 套筒
D. V形块
造成定位误差的原因是 。
A. 定位基准与工序基准不重合
B. 定位基准与测量基准不重合
C. 定位基准的位移
D. 加工过程中刀具的磨损
The passage is primarily concerned with _________.
A. describing a scientific approach to organization management and elucidating the management process
B. analyzing the negative economic impact of applying a western educational value in organization management
C. discussing the strengths of a newly-emerged Chinese management model that contributes to technology breakthroughs
D. comparing and contrasting the special features of Chinese and Western management models
Before the emergence of the Great Bay, one conception that Americans believed in was that __________.
A. the technology development in China could possibly keep pace with the US one day
B. the value of group collective collaboration couldn’t make a technology giant
C. if "me first only" values were indoctrinated to and accepted by students, there would not be technology innovations
D. the values of education systems in a society could be irrelevant to technology breakthroughs
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