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二选择题11 在正常情况下,试验机检定为______.(1)每月一次(2)每年一次(3)一年二次12 试验机偏心率是指室温下试样任意两相对方向上弹性伸长的最大值与______值之差除以平均值的百分比.(1)实测(2)最小(3)平均13 热电偶冷端应保持恒定,允许波动在之内.(1)±0.5℃(2)±0.3℃(3)±1℃
(1) Once a month (2) Once a year (3) Twice a year 12 Eccentricity of the test machine means that the test specimen in any two opposite directions at room temperature (1) Measured (2) Min (3) Average 13 The thermocouple cold end should be kept constant and allowed to fluctuate within. (1) The difference between the maximum value of elastic elongation and the value of ______ divided by the average value. ± 0.5 ℃ (2) ± 0.3 ℃ (3) ± 1 ℃