Yield strength is the stress at which of 0.2% gage length oc

Yield strength is the stress at which of 0.2% gage length occurs.
When equipment of sufficient capacity for such tests is not available,or if excessive length of the bolts or stud makes full-size testing impractical,standard round specimens shall be used that small meet the "machined specimen tests" tensile properties in Table 2.以上两句烦请翻译为汉语.