影响电能表轻载时误差的主要因素除了摩擦力矩之外，还有（）。A

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问题单项选择题

影响电能表轻载时误差的主要因素除了摩擦力矩之外，还有（）。

A、补偿力矩

B、电磁元件装置的几何位置

C、转盘的上下位移

D、通与负载电流的非线性关系影响

答案

参考答案：D

写作题

看图完成答句，一空一词。

1. Who are in the picture?

Some __________ and a __________ are in the picture.

2. How many students are there in the picture?

There are __________. We can see __________ of them are boys and two are girls.

3. What are they doing?

They are having an __________ __________ in a __________.

4. What can we see behind the teacher?

There is a __________ and a big __________ on the __________.

单项选择题

（）？