单项选择题

设某种零件的重量都是随机变量，相互独立且服从正态分布，其数学期望为0.5kg，标准差为0.05kg，问100件零件的总重量超过51kg 的概率是多少？
A、0.5
B、1
C、0.9773
D、0.0227

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未知题型

听力原文：M: As Americana, we tend to be much more casual and informal when we meet peoplE.Our natural inclination to be familiar can put some people on edgE.Germans and Japanese, for example, are very unlikely to use first names in business. Asians prefer to use less eye and physical contact. A universal handshake that most cultures are comfortable with is a single pump handshake that lasts a few seconds. Latins are prone to touching and to smaller personal space, while Asians and Germans enjoy more distancE.The Latin hug is common between men and men and women and women. At home, the Japanese are more comfortable with a bow from the waist. Be sure not to refer to Japanese as 'foreigners' or 'Orientals, ' but instead as international visitors and Asians.
F: With Asian and German associates, punctuality is a must] It is safe to begin a meeting with a more formal tone that can always be relaxed by following their leaD.Business cards are treated with more respect by people from other countries, and there is a strong emphasis on titles and positions. It is helpful to have your cards printed in their language on the back if you are regularly dealing with a particular country. Germans will include university degrees and often the company's founding date on their cards, so you may want to add similar information to yours.
M: Germans, Japanese and Latins value more formality in manners than Americans. Don't stand with hands on hips or talk with hands in pockets. Be tolerant about smoking, as Japanese and Europeans smoke more than Americans. Avoid speaking in a loud voicE.' Respect privacy and a sense of order with Germans. Latins enjoy discussing family, whereas Germans and Japanese generally do not.
F: At business meals, more time is spent on building relationships rather than rushing straight to work. It is appropriate to eat with the silverware constantly in beth hands. Most of the world eats continental stylE.with the fork in the left hand and the knife in the fight, eating off the back of the fork. We, on the other hand, are uncomfortable when people keep both of their wrists above the table for the whole meal. We place the hand we are not eating or drinking with in our laps. Europeans often find it strange and may wonder what we are doing !
M: Be aware that gifts are important, but that some may bo taboo in certain cultures. For example, with Japanese, white is the color of death and four of anything is unlucky. With the Latins, gifts of knives suggest 'cutting' of the relationship. With Germans, red roses signal romantic interests, and carnations signify death. With Mexicans and Brazilians, purple is the color of death, so it's best to avoid purple flowers and gifts. With the Japanese, gifts are normally given and received with a slight bow and are not opened in front of your counterpart.
?You will hear five different business people talking about cultural differences in doing business in different countries.
?For each extract there are two tasks. For Task One, choose the dos described from the list A—H. For Task Two, choose the don’s described from the list A—H.
?You will hear the recording twicE.
TASK ONE—DOS
?For questions 13—17, match the extracts with the dos, listed A—H.
?For each extract, choose the appropriate way stateD.
?Write one letter (A—H) next to the number of the extract.
A Be aware of some taboos.
B Respect a sense of order with Germans.
C Open gifts in front of your counterpart.
D Be punctual with Germans.
E Keep both of your wrists above the table for the whole meal in EuropE.
F Refer to Japanese as 'Orientals'.
G Kep more distance when talking with Asians.
H Add

未知题型

If you thought multimedia was something to be enjoyed in the privacy of your home, think again. Banks are on the frontier of the 'information superhighway' because they spend more on the technology than any other type of civilian business.
Take the case of J. P. Morgan, America's fourth largest bank by assets. It has developed a system whereby deals and documents can be finalized quickly on the computer screen with the help of an electronic pen. Its securities analysts in London and traders in Tokyo can talk to each other via the same screen. And clients' trust can be built up, and deals completed, faster than via a telephone line which carries no pictures.
The new electronic gizmos are currently being introduced into Morgan's trading departments in New York, but eventually they will be used around the world-Aisa includeD.They make it economically possible to establish small dealing rooms in capitals such as Kuala Lumpur and Bangkok, while concentrating Morgan's expensive back-office functions in SingaporE.
Morgan's pioneering effort illustrates how United States banks are using high technology and large amounts of capital to lever their way into Asian markets.
Rivals in Europe and Japan are doing so too, but they do not have the same access to the vast pool of saving available to American banks. US Pension Fund assets, for example, total US $4. 4 trillion, more than three times the size of Japan's.
US institutions are in the best position to act as a bridge between the growing capital demands of Asia and the supply of investment from the rest of the worlD.The bridge, of course, could wobble badly, as it did in the Latin American debt crisis of the 1980s, but this is hard to imagine in the 1990s when the economic fundamentals in Asia look so favorablE.
It took American banks almost a decade to emerge from the Latin American rubble, but they are now formidable competitor. They have written off nonperforming loans and cut payrolls far more boldly than their Japanese counterparts, which are still dogged by soured loans to spendthrift property speculators in Japan.
The US commercial banks' toughest rivals in Asian cross-border business are more likely to be their investment-bank compatriots rather than the Japanese, and the capital markets of Asia, as elsewhere, will be their battlegrounD.
The big five US banks — Citibank, Bank of America, Chemical, Morgan and Chase Manhattan, enjoy the advantage of being big. Compared with firms such as Salomon Brothers and Goldman Sachs, the big five are bigger in most senses of the worD.They have more capital, more staff and more branches worldwide through which to distribute corporate issues.
What remains to be seen is whether they have trading and deal-making ability to compete with investment hanks.

判断题

墙板的垂直度调整通过两根斜支撑上的螺纹套管调整来实现,不能两根斜支撑要同时调整.( )
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错误

设某种零件的重量都是随机变量，相互独立且服从正态分布，其数学期望为0.5kg，标准差为0.05kg，问100件零件的总重量超过51kg 的概率是多少？ A、0.5 B、1 C、0.9773 D、0.0227

相关考题

设某种零件的重量都是随机变量，相互独立且服从正态分布，其数学期望为0.5kg，标准差为0.05kg，问100件零件的总重量超过51kg 的概率是多少？
A、0.5
B、1
C、0.9773
D、0.0227