【单选题】关于平面上的点和线说法错误的是()。
A.
若点位于平面内的一条直线上,则点必在平面上。
B.
若一点在平面上,则一定定在平面上的任意一条直线上。
D.
若直线在平面上,则该直线一定平行于平面内无数条直线。
【单选题】Then professor walked onto the platform and seated himself in a chair, ______ for answering questions.
【判断题】购买行为是引起购买动机的关键因素,是购买动机的基础,是购买动机的起点,同样也是企业市场营销的出发点。 ( )
【判断题】以“公民投票”方式是国际社会发扬民主的重要途径,因此可以采用“公民投票”方式决定的地位和前途。( )
【单选题】The professor walked into the classroom and he carried a bag of books with him.
A.
The professor walked into the classroom,carrying a bag of books with him.
B.
The professor walked into the classroom ,carried a bag of books with him.
C.
The professor walked into the classroom to carry a bag of books with him.
D.
The professor walked into the classroom, carry a bag of books with him.
【判断题】与普通股相比,优先股是标准的股票,也是风险较大的股票。()
【判断题】用等份规来等分一段线时,如果不出现虚线,只需要单击右键即可出现虚线。
【判断题】在自动变速器的行星齿轮机构中,太阳轮、齿圈和行星齿轮 3 者的旋转轴线是重合的。
【判断题】在自动变速器的行星齿轮机构中,太阳轮、齿圈、行星齿轮、行星架这4个元件都可以作为动力传递时的输入、输出部件