单项选择题

在点处有定义是极限存在的（）。 A. 必要条件 B. 充分条件 C. 充分必要条件 D. 无关条件

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单项选择题
According to Maslow’s motivation theory, which one of the following statements is true?
A．Even though the needs at one level are not satisfied, people still move up to seek satisfaction at a higher level.
B．Even though the physiological needs have been met, they are always a strong motivator.
C．Self-actualization needs are often measured by the extent of success and challenge at work.
D．All employee needs are the same and they don’t change with time.
多项选择题
高速摆振的原因有：
A、转向系统机件磨损松旷
B、车轮动不平衡
C、四轮定位失准
D、悬架变形、车身共振