某钢尺的尺长方程为:l<sub>t</sub>=30.000-0.003+1.2×10<sup>-5</sup>×30×(t-20℃)。现用该钢尺量的AB的距离为100.00m,则距离AB的尺长改正数为()
A、–0.010m
B、–0.007m
C、+0.005m
D、+0.007m
A、–0.010m
B、–0.007m
C、+0.005m
D、+0.007m
A、–0.010m B、–0.007m C、+0.005m D、+0.007m
A、–0.010m B、–0.007m C、+0.005m D、+0.007m
A、偶然误差 B、既不是偶然误差也不是系统误差 C、偶然误差也可能是系统误差 D、系统误差
A、A.0.0185 B、B.-0.0185 C、C.0.5544 D、D.-0.5544