【单选题】When the circular-section low-carbon steel specimen is tensed until rupture, the gauge distance is changed from 100mm to 130mm, and the diameter is changed from 10mm to 7mm, then the Poisson rat io is...
【单选题】When drawing external threads, major diameter d is drawn in ( ) solid lines, minor diameter d1 is drawn in ( ) solid lines, but only a 3/4 circle is drawn in the circle view, and the minor diame...