(7)C(8)B(9)A( 10)D( 1 1)B( 12)A

1. Set the setting rules

University of California, Los Angeles.

2. Assume that the function is continuous and the value of the constant is

A.2 B.3 C.4 D.5

3. The value of the complex number is

A.- 1。

4. Given the function, the following conclusions are wrong.

A. The minimum positive period of a function is b, and the function is increasing function in the interval.

C. the image of the function is symmetrical about a straight line. D. The function is odd function.

As shown in the figure, it is known that the bottom of the hexagonal cone is a regular hexagon, so the following conclusion is correct.

plane

C. straight line ∑ plane d.

6. It is called a real number. Then'' is''

A. Sufficient and unnecessary conditions B. Necessary and insufficient conditions

C. Necessary and sufficient conditions D. It is neither a sufficient condition nor a necessary condition

7. It is known that the left and right focal points of hyperbola are respectively, and one of its asymptote equation is, and the point is on hyperbola, then =

A. 0d 4 BC

8. As shown in the figure, there are three points on a sphere with a radius of 3, and the distance from the center of the sphere to the plane is, so the spherical distance of these two points is.

A.B. C. D。

9. Given the straight line and the straight line, the minimum value of the sum of the distances from a fixed point on the parabola to the straight line and the straight line is

A.2 B.3 C. D

10. An enterprise produces two kinds of products, A and B. It is known that each ton of A product needs 3 tons of raw materials and 2 tons of raw materials; It takes 1 ton of raw material A and 3 tons of raw material B to produce each ton of product B. Selling a product can make a profit of 50 thousand yuan per ton, and B product can make a profit of 30 thousand yuan per ton In a production cycle, if the raw material A consumed by an enterprise does not exceed 13 tons and the raw material B consumed does not exceed 18 tons, then the maximum profit that an enterprise can obtain is

A. 1.2 million yuan, b.20 million yuan, c.25 million yuan and d.27 million yuan.

1 1.3 Three boys and three girls * * * Six students stand in a row. If boy A doesn't stand at both ends and only two girls out of three are adjacent, then the number of species in different rows is

A. 360 BC to 228 BC

12. If the known function is an even function defined on a set of real numbers and has any real numbers, the value of is.

BC 1 year.