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190215	If a coin is even, and the possibility of the occurrence of showing the head and the tail are equal. What is the probability that the head shows up at least one time?
190215	Event E and event F are independent events. The probability of the occurrence of event E is 0.4 and that of event F is 0.5. What is the probability that the events occur at the same time?
190215	The relationship between the height h of the ball and the time t satisfies h(t)=-5$$t^{2}$$+$$v_0$$t . The initial velocity $$v_0$$ is 36 m/ s. How long does it take for the ball to return to its initial height?
190215	The building materials factory produces two sizes of columns. The cross-sectional area of a large cylinder is three times that of a small cylinder. How many times the radius of the bottom of a large cylinder is that of a small cylinder?
190215	There are five seats in the classroom. How many different arrangements are there for five students?
190215	Is the sum of x and y a multiple of 3? x,y,z are integers. 1: x+z is a multiple of 3. 2: x+2z is a multiple of 3.
190215 还原机经选题	5 days from today is Tuesday, when is 100 days from today?
190215	The probability of occurrence of event A is X. The probability of occurrence of event B is Y, and the probability of simultaneous occurrence of events A and B is Z. A. What is the probability of the occurrence of at least one event?
190215 还原机经选题	$$\frac{0.0004810^{n}}{4^{2}}$$ < 210^{18}.n is an integer. What is the maximum value of n?
190215	Five boys and four girls are supposed to be arranged in a line. Boys and girls must be arranged alternately, that is to say, boys' left and right must be girls. How many queuing methods are there?
190215	Which of the following options has the standard deviation greater than that of the sequence {- 20, - 10,0,10,20}?
190215	In the rectangular coordinate system, the center of a circle is the origin and the radius is r. The center of the other circle is (1,1) with a radius of R. Is the distance between the centers of two circles r + R? 1:$$r^{2}$$+$$R^{2}$$-=2(1-rR) 2:$$R^{2}$$-$$r^{2}$$=2r
190215	Someone wants to buy n apples. She has two plans. The first option is to buy a basket of apples for $6. The second option is to buy one by one, and the price of each apple is $0.32. Is the first plan more cost-effective than the second? 1: n less than 20 2: n + 4 apples can be bought with $7.04 in the second way.
190215	Is 3 a factor of 25$$10^{n}$$$$x^{10^{2n}}$$? 1:n=2 2:x=17
190215	In a scenic spot, adult tickets and child ticket accounted for 60% and 40% of the tickets sold in one year. Sales of adult tickets were 75% of the total turnover. Which of the following may be the selling unit price of adult ticket and child ticket?
190215	The distribution of students' scores is shown in the table. What is the median score of these students?
190215	How many solutions to equation (x + 1) (x-2) + (x + 1) (x-4) = 0?
190215	Is $$x^{4}$$ < $$x^{2}y^{2}$$ ? 1:$$x^{2}$$ < $$\frac{1}{4}$$ 2:$$x^{2}$$ < $$\frac{x}{4}$$
190215 还原机经选题: 数论&代数	Is n the square of an integer? n is an integer. 1:4n is the square of an integer 2:$$n^{3}$$ is the square of an integer
190215	Is 4 a factor of 4? 1: x-y is even. 2: x+y is even.