题目内容

手信号分为信号灯、信号旗、徒手信号三类。

A. 对
B. 错

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用霍尔法测直流磁场的磁感应强度时,霍尔电压的大小

A. 与霍尔片的厚度d成正比
B. 与霍尔片上的工作电流Is的大小成正比
C. 与霍尔材料的性质无关
D. 与外加磁场的磁感应强度的大小成反比

利用霍尔效应测量磁感应强度实验中,使用了什么方法消除副效应

A. 比较法
B. 模拟法
C. 对称法
D. 放大法

用作图法处理数据时,为保证精度,至少应使坐标纸的最小分格和测量值的()相对应。

A. 最后一位有效数字
B. 最后一位准确数字
C. 第一位有效数字
D. 第二位有效数字

An army depot that overhauls ground mobile radar systems is interested in improving its processes. The shop floor supervisor believes that having standard work procedures in place will reduce the time required for troubleshooting this component. Time (in minutes) required troubleshootingthis component without and with the standard work procedure is recorded for a sample of 19 employees.

A. This is a one-tailed paired t-test.
B. This is a two-tailed test of two independent means.
C. This is one-tailed test of two independent means.
D. This is a two-tailed paired t-test.

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