题目内容
（请给出正确答案）
Models drawn by the system analysts during the process of the structured analysis are(75)
A．PERTs
B．ERDs
C．UMLs
D．DFDs
安装简答题APP，拍照搜题省时又省心！
更多“Models drawn by the system ana…”相关的问题
The characters of modern logistics are huge quantity, quick response and globalization. In order to meet the needs, information technology has become the brain to control them. Bar code, POS, EDI, GPS and Internet are the main choices for the operation of logistics. Bar code system can get the goods information fast and exactly. By the data processing unit, POS system can check the inventory of warehouse at any time. When the super center adopts POS system, it can check the sales record, inventory even cash flow easily. EDI is a magic tool that can ranslate your documents into electronic data, and sent it to your partner in any location by cable. In this way, we don't need to make deals face-to-face, revise the documents, declare to customs before the shipments arrived, and so on. Now, EDI is the most essential information tool for information trade and logistics. All of information tools are based on Internet. In today's society, the organs of commercial and government, schools, even individual can make E-commerce with Internet. So, Internet is the greatest revolution to influence the mankind. Questions: 1. Information technology can help the operation of the logistics, but can't change its future. Is it correct?_____
A、Yes
B、No
C、
D、
B.vases
C.All
D.are
| 阅读理解。 |
| The biggest safety threat facing airlines today may not be a terrorist (恐布分子) with a gun, but the man with the portable computer in business class. In the last 15 years, pilots have reported well over 100 incidents that could have been caused by electromagnetic (电磁) interference (干扰). The source of this interference remains unconfirmed, but increasingly, experts are pointing the blame at portable electronic device such as portable computers, radio and cassette players and mobile telephones. RTCA, an organization which advises the aviation (航空) industry, has recommended that all airlines ban (禁止) such devices from being used during "critical" stages of flight, particularly take-off and landing. Some experts have gone further, calling for a total ban during all flights. Currently, rules on using these devices are left up to individual airlines. And although some airlines prohibit (禁止) passengers from using such equipment during take-off and landing, most are reluctant to enforce a total ban, given that many passengers want to work during flights. The difficulty is prediction how electromagnetic fields might affect an aircraft's computers. Experts know that portable device emit radiation which affects those wavelengths which aircraft use for navigation and communication. But, because they have not been able to reproduce these effects in a laboratory, they have no way of knowing whether the interference might be dangerous or not. The fact that aircraft may be vulnerable (易受损的) to interference raises the risk that terrorists may use radio systems in order to damage navigation equipment. As worrying, though, is the passenger who can't hear the instructions to turn off his radio because the music is too loud. |
| 1. The passage is mainly about _____. |
[ ] |
| A. effective safety measure of aircraft crashes B. a possible cause for air flight accidents C. the defects (缺点) of electronic devices D. a new regulation for all airlines |
| 2. What is said about the over 100 aircraft incidents in the past 15 years？ |
[ ] |
| A. They may have taken place during take-off and landing. B. They may have been caused by the damage to the radio systems. C. They were suspected to have resulted from electromagnetic interference. D. They were proved to have been caused by the passengers' portable computers. |
| 3. Few airlines want to impose (强加) a total ban on their passengers using electronic devices because _____. |
[ ] |
| A. they have other effective safety measures to fall back on B. they don't believe there is such a danger as radio interference C. the harmful effect of electromagnetic interference is yet to be proved D. most passengers refuse to take a plane which bans the use of radio and cassette players |
| 4. Why is it difficult to predict the possible effects of electromagnetic fields on an airplane's computers？ |
[ ] |
| A. Because experts lack adequate equipment to d such research. B. Because it is extremely dangerous to conduct such research on an airplane. C. Because it remains a mystery what wavelengths are liable to e interfered with. D. Because research scientists have not been able to produce the same effects in labs. |
| 5. It can be inferred from the passage that the author _____. |
[ ] |
| A. hasn't formed his own pinion on this problem B. has overestimated the danger of electromagnetic interference C. thinks it is unreasonable to exercise a total ban during flight D. is in favor of prohibiting passengers' use of electronic devices completely |
A、The combination of hemoglobin with O2 facilites the release of CO2.
B、The combination of hemoglobin with CO2 facilites the release of O2.
C、The combination of hemoglobin with CO2 inhibits the release of O2.
D、The combination of hemoglobin with O2 inhibits the release of CO2.
E、combination of hemoglobin with O2 facilite the combination with CO2.
A、Language is writing.
B、Language is an arbitrary system.
C、Language is conventional.
D、Language is a system which relates meaning to substance.
E、Language is a mental phenomenon and innate.
F、Language is universal.
A、take
B、who take
C、taking
D、who taking
A、If no
B、no TV
C、watch
D、listen
A、think
B、going to
C、the movie
D、spend
为了保护您的账号安全，请在“简答题”公众号进行验证，点击“官网服务”-“账号验证”后输入验证码“”完成验证，验证成功后方可继续查看答案！
微信搜一搜
简答题
微信搜一搜
简答题
如搜索结果不匹配，请 
