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一、选择题:本大题共12小题,每小题3分,共36分.在每小题给出的四个选项中,只有一项是符合题目要求的.1.下列说法中正确的是( ).A.任何一个平面图形都是一个平面B.三个平面可将空间最多分成八个部分C.分别在不同平面内的两条直线是异面直线D.在空间中,垂直于同一直线的两条直线互相平行2.三条直线两两垂直.给出下列四个结论①这三条直线必共点;②其中必有两条是异面直线;③三条直线不可能共面;④其中必有两条在同一平面内.正确的结论共有( ).
First, the multiple-choice questions: The big problem a total of 12 small problems, each small problem 3 points, a total of 36 points in each of the four options given, only one is in line with the requirements of the title.1 The following statement is correct Is (A.) Any one of the plan is a plane B. Three planes can be divided into space up to eight C. The two lines in different planes are different surface straight line D. In space, the vertical The two straight lines on the same line are parallel to each other. 2. The three straight lines are perpendicular to each other. The following four conclusions are given: ① The three straight lines must be common; ② Two of them must be out of line; ③ The three straight lines can not be coplanar; ④ of which there must be two in the same plane. The correct conclusion of a total ().