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问题 判断题

三个最大值相等，角频率相同，彼此互差90度的电动势叫做三相对称电动势。

答案

参考答案：错

解析：三个最大值相等，角频率相同，相位互差120度的电动势叫做三相对称电动势。

单项选择题

组织体能训练时，要遵循体能训练的内在规律，加强体能训练的（）。

A、计划性

B、安全性

C、实效性

D、科学性
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单项选择题

When you open a file or run a program in a computer, a window appears on the desktop of your computer. The (67) of the window indicates which program you are currently working in arid its color will become blue if a window is active. When you click on The (68) , the window disappears and appears as a button on the taskbar. Clicking on a button in (69) will invoke a specific command.

A．maximize button

B．restore button

C．close button

D．minimize button
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