变频器的基本频率是指输出电压达到( )值时输出的频率值。
A.U N
B.U N/2
C.U N/3
D.U N/4

未分类题That Microsofts three tasks are colliding is reflected in the fact that______.A．the new operating system will be marketed at a discountB．search will be removed from the new operating systemC．all search capabilities will be combined into the desktopD．images and data will be exchanged more directly

判断题美国哈佛大学医学院特设委员会提出“脑功能不可逆”作为新的死亡标准不包括脑电波平直。()

判断题护理社会学没有自然科学的属性。()

判断题精神疾病的社会预防总目的是降低发病率。()

判断题预订，是指在客人抵店前对酒店客房的预先订约。预订在得到酒店的确认后，酒店与客人之间便确立了一种合同关系。()

判断题“技术确定性程度越高，组织结构设计越应灵活、宽松、分权、放权。”()

判断题护理人员的最基本责任有促进健康、预防疾病、恢复健康和减轻痛苦。()

判断题是否有担保品是5C评价法的内容。()

单项选择题发行后可以在证券交易市场上自由交易的国债是：( )

单项选择题下列各项中，属于会计人员填制记账凭证时对经济业务进行分类的依据是()。

未分类题Jaak Panksepps study on a mouse proves that the seeking driveA．originates in the limbic system.B．involves parts of the forebrain.C．controls how we respond to stimulus.D．exists in many other animals.

未分类题According to Mark Solms, dreamingA．takes place during the whole sleeping period.B．involves a primitive part of the brain known as the pons.C．is closely related to the 'seeking' emotion.D．starts at the same time as libido appears.

未分类题Which of the following terms is equivalent to what Freud called libido?

未分类题Which of the following statements is true?A．People in the south of Japan prefer sweet drinks while people in Tokyo like bitter ones.B．7-Up sold badly in Shanghai because local people didn't like the name of this drink.C．7-Up remained on shelves in Shanghai because local people didn't like drinking.D．The Marlboro ad focused on the horse in Hong Kong because cowboy means coolie in the local dialect.

未分类题Which of the following is true according to the text?A．People can hardly reduce the sources of pressure.B．Even training classes are not effective in offering skills to deal with pressure.C．One should first know the sources of stress while asking for help.D．Taking drugs and alcohol, though bad ways of coping with pressure, might be effective.