解析 C 这道题的含义是:对于质数2017的因数之和是多少? 首先明确质数的含义,质数是指在大于1的自然数中,除了1和它本身以外不再有其他因数的自然数. 2017只有1和它本身两个因数. 2017+1=2018,即因数之和是2018. 选择C选项.结果一 题目 What is the sum of the factors of the prime number 2017? A...
Which of the following is a prime number?( ). A. 2017B. 2018C. 2015D. 2016相关知识点: 试题来源: 解析 A 这道题的含义是:四个选项中哪个选项是质数; 首先明确质数的含义,质数是指在大于1的自然数中,除了1和它本身以外不再有其他因数的自然数. 2017只有1和它本身两个因数,所以它是质数; 2018=2...
of 2. Mer-senne primes, logically enough, are Mersenne numbers that are alsoprime. The number 3 is a Mersenne prime because it’s one less than 22,which is 4. The next few Mersenne primes are 7, 31, and 127.M74207281 is the 49th known Mersenne prime. The next largestknown prime,...
A study conducted by the journal Royal Society Crisis, showed that 60% of the world’s largest land mammals are near extinction, due to high demand for bushmeat or game meat in Africa. More than 300 species are at risk of getting wiped out. What's behind China's growing appetite for ...
Chinese museums held a total of 30,000 exhibitions each year, receiving 900 million visitors, according to the State Administration of Cultural Heritage (SACH) on Thursday. Int'l Museum Day: A look at museums' most precious treasures World’s largest botanical garden to open on China’s Nation...
Canada’s development of clean technology is outstanding globally, and it has natural advantages in dealing with climate change. However, due to its growing population and the dependence of economic development on energy, Canada is now one of the world’s largest emitters of greenhouse gases per ...
China has the world’s second-largest nominal GDP in current dollars and the largest in terms of PPP. Its economy has seen historical growth in the last two decades, causing some economists to speculate that China may overtake the U.S. as the world's largest economy in the future. As ...
The moves have generated extensive confusion and uncertainty at the nation’s largest research agency, which has become a target for Trump’s political allies. “The impact of the collective executive orders and directives appears devastating,” one senior NIH employee says. … ...
2007). SF2, the largest of the superfamilies, is further divided into several defined families, one of which is the DEAD-box family of RNA helicases (Fairman-Williams et al. 2010). The proteins in this family have received their name from the presence of a conserved stretch of amino ...
China has the world’s second-largest nominal GDP in current dollars and the largest in terms of PPP. Its economy has seen historical growth in the last two decades, causing some economists to speculate that China may overtake the U.S. as the world's largest economy in the future. As ...