单项选择题

剪映编辑的视频不能添加封面。（）
A. 对

B. 错

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制动是把正在运转的直流电动机的电枢两端突然反接，并维持其励磁电流方向不变的制动方法。

A．能耗
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ABC produces a variety of soft drink. It has two competitors but all three producers use product differentiation to distinguish themselves from each other. What type of market is this?

A．Perfect competition
B．Monopoly
C．Monopolistic competition
D．Oligopoly