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【判断题】
对某一个量进行了多次观测，则其算术平均值就是A.
正确
B.
错误
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【简答题】12) 同步电机工作时励磁绕组中应通入 。
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【单选题】万用表主要有两种 : 机械指针式万用表和数字式万用表。初学者最好使用指针式,因为指针式万用表有助于他们熟悉一些电子原理。
A.
There are two main kinds of multimeters, they are mechanical handy multimeters and digital ones.
B.
There are two main kinds of multimeters, they are mechanical handy multimeters and digital ones. It's better for learners to use handy types, because it's helpful for them to be familiar with some electronic principles.
C.
There are two main kinds of multimeters, they are mechanical handy multimeters and digital ones. it's helpful for them to be familiar with some electronic principles.
D.
There are two main kinds of multimeters, they are mechanical handy multimeters and digital ones. Multimeters having only volt and ohm ranges are also called volt -ohmmeters.
【简答题】万用表是一种实用、( )的便捷式电气测量仪表,常用的万用表有( )万用表和数字式万用表。
【简答题】12) 同步电机工作时励磁绕组中应通入 。