1, given set,, then ()
(A) (B) (C) (D)
2. Let the complex number satisfy, then ()
(A) (B) (C) (D)
3. The sum of the previous geometric series is known, then ().
(A) (B) (C) (D)
4. It is called straight line, plane and plane. If the straight line satisfies,,, then ()
(a) and (b) and
(c) intersects with, and the intersection line is perpendicular to (d) and parallel to.
5, known expansion coefficient is, then ()
(A) (B) (C) (D)
6, execute the right block diagram, if input, then output ()
(A) (B)
(C) (D)
7. The coordinates of the vertices of the tetrahedron in the spatial rectangular coordinate system are,,,, respectively. When drawing the front view of a tetrahedron in three views, take the plane as the projection plane, and the front view can be ().
(A) (B) (C) (D)
8. If,,, then ()
(A) (B) (C) (D)
9, known, meet the constraints, if the minimum value of is, then ()
(A) (B) (C) (D)
10, known function, the following conclusion is wrong ().
(1),
(b) The image of the function is a centrally symmetric graph.
(c) If it is the minimum point, it decreases monotonically in the interval.
(d) If it is an extreme point, then
1 1, let the focus of the parabola be, the point is above, and if the circle of diameter passes the point, the equation is ().
(a) or (b) or
(c) or (d) or
12, known points,, and straight lines will be divided into two parts with equal areas, so the value range of is ().
(A) (B) (C) (D)