1、
2、
for screw thread micrometer, it only measures the pitch diameter of an external or internal thread.
螺纹千分尺只能测量于外或内螺纹的中径。
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3、
The connecting sleeve is bolt jointed with the connecting screw via the left internal thread.
连接套筒通过左内螺纹与连接螺杆相螺接；
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4、
