问题：
[单选题]滚珠丝杠螺母副的支承方式中，若用于刚度和位移精度都很高的场合，应选用（ ）。
A、一端固定、一端自由
B、两端游动
C、一端固定、一端游动
D、两端固定
参考答案：
D
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- ● 滚珠丝杠螺母副的内循环结构是指滚珠在循环过程中（）
- ● 滚珠丝杠螺母副的外循环结构是指滚珠在循环过程中（）
