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300难题
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In quadrilateral ABCD, is angle BCD a right angle?
1.Angle ABC is a right angle.
2.Angle ADC is a right angle.
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300难题
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If x is a positive integer, how many positive integers less than x are divisors of x ?
1. $$x^{2}$$ is divisible by exactly 4 positive integers less than $$x^{2}$$.
2. 2x is divisible by exactly 3 positive integers less than 2x.
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300难题
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The first four digits of the six-digit initial password for a shopper's card at a certain grocery store is the customer's birthday in day-month digit form. For example, 15 August corresponds to 1508 and 5 March corresponds to 0503. The 5th digit of the initial password is the units digit of seven times the sum of the first and third digits, and the 6th digit of the initial password is the units digit of three times the sum of the second and fourth digits. What month, and what day of that month, was a customer born whose initial password ends in 16 ?
1.The customer's initial password begins with 21, and its fourth digit is 1.
2.The sum of the first and third digits of the customer's initial password is 3, and its second digit is 1.
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300难题
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If K is a positive integer less than 10 and N = 4,321 十 K, what is the value of K ?
1.N is divisible by 3.
2.N is divisible by 7.
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300难题
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If b is an integer, is $$\sqrt{a^{2}+b^{2}}$$ an integer?
1.$$a^{2} + b^{2}$$ is an integer.
2.$$a^{2} - 3b^{2}$$ = 0
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300难题
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Is x an integer?
1.$$x^{2}$$ is an integer.
2.$$\frac{x}{2}$$ is not an integer.
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300难题
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Each entry in the multiplication table above is an integer that is either positive,negative, or zero. What is the value of a ?
1.$$ h\neq 0$$
2.c = f
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300难题
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Ben and Ann are among 7 contestants from which 4 semifinalists are to be selected. Of the different possible selections, how many contain neither Ben nor Ann?
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300难题 OG17
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It may someday be worthwhile to try to recover uranium from seawater, but at present this process is prohibitively expensive.
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300难题 OG17
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To read of Abigail Adams' lengthy separation from her family, her difficult travels, and her constant battles with illness is to feel intensely how harsh life was even for the so-called aristocracy of Revolutionary times.
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300难题
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When Medicare was enacted in 1965, it was aimed at the prevention of a catastrophic illness from financially destroying elderly patients.
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300难题
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Sartre, an inadvertent guru, had an opinion on everything, painfully considered, elaborately reasoned, often changed.
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300难题
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Some biographers have not only disputed the common notion that Edgar Allan Poe drank to excess but also questioned whether he drank at all.
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300难题
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In the traditional Japanese household, most clothing could be packed flatly, and so it was not necessary to have elaborate closet facilities.
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300难题
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The Rorschach test is gaining new respect as a diagnostic tool because it takes only one hour to expose behavior and thought processes that may be unlikely to emerge in other procedures or weeks of ordinary interviewing.
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300难题
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When bitter managerial conflicts plague a small company, conflicts that in the past might have led to dissolution of the business, executives are likely to turn to outside professional counselors to help resolve disagreement.
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300难题
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The prime lending rate is a key rate in the economy: not only are the interest rates on most loans to small and medium-sized businesses tied to the prime, but also on a growing number of consumer loans, including home equity loans.
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300难题
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Some historians of science have argued that science moves forward not so much because of the insights of great thinkers but because of more mundane developments, such as improved tools and technologies.
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300难题 300难题
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In despite of the steady population flow out from rural areas into urban clusters, nearly 5 million farm households are still in Japan out of a total population of some 116 million people.
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300难题
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A star will compress itself into a white dwarf, a neutron star, or a black hole after it passes through a red giant stage, depending on mass.
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