问答题

并励直流电动机，当电源反接时，其中Ia的方向，转速方向。

答案：反向，不变。

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单项选择题

As a business owner, you’re responsible for making the decisions that pertain to the profitability of your business. This decision-making freedom best reflects the _____ advantage of small business ownership.
A、independence
B、first-mover
C、lifestyle
D、financial

奶泡打发成功的标准之一是表面要能反光、细腻，像天鹅绒般滑口。

答案：正确