测量及机床检验(国外英文资料).doc

测量及机床检验(国外英文资料) Measurement and machine tool inspection (67 questions) Measurement theory and method There are two kinds of measurement errors, that is, absolute error and relative error. In the case of absolute error, the correct description is (BD). A, absolute error is the ratio of the measured value to its true value B, absolute error is the absolute value of the difference between the measured value and its true value C and absolute error is a dimensionless data D and absolute error are suitable for assessing or comparing the measured accuracy of the same size E and absolute error are suitable for assessing or comparing the measured accuracy of measurements of different sizes There are two kinds of measurement errors, that is, absolute error and relative error. For the relative error, the correct description is (ACE). A and relative error refer to the ratio of the measured value to its true value B, relative error is the absolute value of the difference between the measured value and its true value C and relative error is a non dimensional data D and relative error are suitable for assessing or comparing the measured accuracy of the same size E and relative error are suitable for assessing or comparing the measured accuracy of measurements of different sizes A vernier caliper is used to measure the center distance, and this method of measurement belongs to (B) A, direct measurement of B, indirect measurement of C, absolute measurement of relative measurements of D In precise measurement, the repeated measurements of the same measured geometry are performed to reduce the influence of (A) on the measurement results. A, random error B, systematic error C, relative error D, absolute error The best advantage of adopting the optical tool setting mirror is that the tool setting method is (b), and the tool tip can be protected. A and contact measurement methods, B and non-contact measurement methods C, induction measurement, D, non inductive measurement For the cone wo