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单项选择题

为向教师和学生不断提供学习成败的反馈，制定或修改教学计划，而在教学过程中进行的测量称为（ ）。

A. 终结性测量
B. 形成性测量
C. 标准参照性测量
D. 常模参照性测量
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相关考题

单项选择题
​Which of the following news media organizations was launched in 2016? ​
A．Xinhua News Agency
B．CGTN
C．CRI
D．China Daily
单项选择题
依据一定的标准，运用科学的方法，对教学活动进行价值判断，此活动属于（ ）。
A. 教学设计
B. 教学实施
C. 教学策略
D. 教学评价
问答题

Figure (a) is a practical circuit for the fluorescent lamp, whose equivalent circuit is shown in figure (b). The fluorescent lamp can be regarded as a resistor, and its parameters are 110V, 40W. The ballast is an inductor, the supply voltage is 220V, and the frequency is 50Hz. To ensure that the voltage across modulator tube is 110V. Find:① the current I=[填空1]A; ② the inductance L of the ballast =[填空2]H;     ③ the power factor cosφ1 of the circuit this moment =[填空3];   ④ if the power factor of the circuit is raised to1, the capacitance C need to be connected in parallel =[填空4]μF；  ⑤ the reactive power QC delivered by the capacitor =[填空5]Var.
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