单选题某剧院正在上演一部新歌剧，前座票价为50元，中座票价为35元，后座票价为20元，如果购到任何一种票是等可能的，现任意购买到2张票，则其值不超过70元的概率为()．　　

单选题设f(x)二阶连续可导，且则______.

单选题下列结论正确的是(A)若函数f(x)在[a，b]上可积，则f(x)在[a，b]上必有界；反之，若函数f(x)在[a，b]上有界，则f(x)在[a，b]上必可积．(B)若函数f(x)在[a，b]上可积，则f(x)在[a，b]内必定有原函数；反之，若函数f(x)在[a，b]内有原函数，则f(x)在[a，b]上必定可积．(C)若函数f(x)在任何有限区问上可积，则对任一点c，有(D)若函数f(x)在[a，b]上可积，则必存在ξ∈[a，b]，使得

单选题设函数f(x)在(0，1)上可导且在[0，1]上连续，且f'(x)＞0，f(0)＜0，f(1)＞0，则f(x)在(0，1)内( )。A．至少有一个零点B．有且仅有一个零点C．没有零点D．零点的个数不能确定

单选题设f'(lnx)=1+x，则f(x)等于()

单选题若α2，1，β2成等比数列，而成等差数列，则=______．

单选题∫3xdx=____A．6x2+CB．3x2+CC．2x2+CD．

单选题关于z的方程lg(x 2 +11x+8)-lg(x+1)=1的解为______

单选题某工厂二月份产值比一月份产值增加10％，三月份产值比二月份产值减少10％，那么( )．

单选题48支足球队，等分为8组进行初赛，每组中的各队之间都要比赛一场，初赛中比赛的总场数是 ____ ．

单选题Until recently, mobile radio was to wireless communications what the Yugo was to transportation. With a mixed clientele ranging from truckers using CBs to police armed with walkie-talkies to taxi drivers dispatched by radio, it was viewed as an unglamorous business and a technological backwater. But specialized mobile radio, as it is known, has been rediscovered. It is now considered one of the biggest prizes in the all-out war for the public airwaves. The reason: high-tech companies have figured out how to profitably rebuild the antiquated dispatching system into an advanced cellular-telephone network that can take on the likes of AT & T and the giant Baby Bells. Upstart Nextel Communications sent shock waves through the industry last week when it agreed to buy Motorola's SMR frequencies for $1.8 billion. That could pose a serious threat to cellular hegemony. Although both systems are based on the same basic technology, SMR systems are digital and cover almost 25 times as much area as the average cellular network. SMR handsets won't work on cellular systems and tend to be bulkier than cellular phones, though they provide more features, like a digital pager service. And while cellular growth has tripled to some 13 million subscribers since 2000, the technology has been losing ground. It is running out of channel capacity so fast, in fact, that 40% of cellular calls in high-density areas like Manhattan and Los Angeles fail to be completed. SMRs have capacity to spare, and service could eventually be priced 10% to 15% less than cellular. Dispatchers predict they will have at least 10 million subscribers by the end of the decade. There are now about 1.5 million users of SMRs. The addition of another contender to an already crowded field of telephone systems will surely multiply the confusion. By the year 2010, consumers will be able to choose from at least half a dozen vendors of a dizzying array of wireless-communications services, including pagers, voice mail answering machines and cellular phones. Phone and cable television operators, such as Bell South, MCI and Cox Enterprises, are developing so-called personal communications networks, or PCNs, a highly advanced portable-phone system that is expected to cover a wider area, connect to a greater variety of services and be cheaper to operate than conventional cellular. And many companies that have gambled on the wrong technological standards, and invested billions trying to develop the same markets, will undoubtedly lose a great deal of money before the shakeout is over. "The winners," says Nextel chairman Morgan O'Brien, "will be those who can make the choice for consumers easy." With all the anticipated confusion--mindful of the early years of personal computers--it is likely to be years before anyone calls the purchase of wireless products an "easy" choice.

单选题A．-2B．2C．4D．5

单选题______．

单选题动物园的饲养员给三群猴子分花生．如果只分给第一群，则每只猴子可得12粒；如果只分给第二群，则每只猴子可得15粒；如只分给第三群，则每只猴子可得20粒．那么平均分给三群猴子，每只猴子可得( )粒．