Long-haul flights get longer

Long-haul flights have just got longer, with a non-stop flight from Singapore to New York now in operation. But 18 hours in the air creates its own challenges. A lot of preparation goes into the ultra long haul flight. The aircraft is specifically designed for the journey with more space and extensive entertainment services. The flight crew are also specially trained.

The seasoned traveller is also more aware of the health risks associated with a flight that covers as much as 16,600-kilometers (10,310-miles) in distance. Exposure to lower oxygen levels for up to 18, maybe 20, hours is abnormal for the human body. With deep vein thrombosis (DVT) the problem really starts occurring after 12 hours (in-flight). This could lead to an increase in heart attacks.

Doctors believe prevention is better than cure when it comes to in-flight health. Passengers on ultra long range flights need to be provided with flight socks and, if necessary, tablets for thinning the blood. It is not just the health and vitality of the passenger that is at stake on a flight of this length, but also that of the flight crew. "They give us training on fatigue management and how to adjust to the local time in New York and to exercise, as well as take care our diet and eat lightly in-flight," says Linda Wu, a stewardess on Singapore Airlines.

However, passengers are trading in health concerns for convenience. An extra- long flight means passengers do not need to break up their journey and change planes. "They like to board once, de-plane once. It is saving time," says James Williams from Singapore Airlines.

"From Los Angeles to Singapore, passengers are saving two and a half hours. And to New York passengers are saving up to four hours in flying time." Thai Airways is also launching a non-stop service to New York from Bangkok next June to compete with Singapore Airlines. It is planning a similar service to Chicago. Cathay Pacific, Continental, Qantas and Emirates Airlines also offer flights that are more than 14 hours in duration. However, there is still a question of whether longer non-stop flights will become popular. "They will certainly have a role in the future of aviation, there is no doubt about it. People will prefer to fly non-stop if it is available," says Chris Johnson, an airline analyst. "But we are reaching the limits. These markets are at the very margin of aviation. Most airlines still fly in the eight to 12-hour sector. This is still where the biggest volume in traffic is." Avery believes that geography will determine the demand for the ultra long-haul flight and that worldwide appeal for this type of flight is unlikely. "Asia is where the demand is for the ultra long-haul flight. They are connecting Asian cities to the U.S. East Coast, which is the big market," he explains. "The routes that connect most places that European business travellers go do not need a capacity and endurance to fly 18-hours -- this is the same for U.S. carriers."

1. Why are longer flights potentially harmful to passengers and crew?

 A. Because there isn't as much oxygen in the air.
 B. People will get bored
 C. long periods of inactivity will damage their bones

2. What are flight socks?

 A. special socks to keep the plane free of harmful bacteria
 B. one of the preventive measures planned by airlines
 C. socks that stop your blood getting too thin

3. Which of the following methods of countering the health problems caused by long flights is NOT mentioned?

A. how best to cope with jet lag
 B. advice on food consumption during a flight
C. advice on drinking alchohol

4. What are the advantages of longer flights?

 A. There are less problems with jet lag
 B. passengers save time
 C. passengers get a good break between flights

5. Where is the market for longer flights expected to develop?

 A. between Europe and America
 B. between Asia and America
 C. between Asia and Europe

(đáp án + giải thích để tránh copy mạng)

2

- Edmund Cartwright là nhà phát minh máy dệt vải, phát minh đầu tiên trong ngành dệt, phát minh năm 1785 có năng suất gấp 40 lần

- Ý nghĩa:

* Tích cực 

- Sự phát triển của khoa học - kĩ thuật đã mang lại cuộc sống vật chất và tinh thần tốt đẹp hơn cho con người.

* Hạn chế 

- Mặt khác, chính những thành tựu khoa học cũng được sử dụng để trở thành phương tiện chiến tranh gây thảm họa cho nhân loại qua hai cuộc chiến tranh thế giới.

- Nước xuất khẩu tư bản đứng thứ 2 thế giới là Pháp

Câu 1: Dẫn 1 luồng khí H₂ đi qua 16 gam bột CuO nung nóng. Sau phản ứng thu được chất rắn, hòa chất rắn thu được vào axit HCl dư thì thấy có 9,6 gam chất rắn không tan. Tính hiệu suất của phản ứng?
Câu 2: Người ta điều chế CaO bằng cách nung đá vôi. Lượng CaO thu được từ 1 tấn đá vôi có chứa 10% tạp chất là 0,45 tấn. Tính hiệu suất phản ứng?
Câu 3: Một loại đá vôi chứa 80% CaCO₃, còn lại là tạp chất không tan. Nung 125g đá vôi loại trên thu được 97,5g chất rắn. Tính hiệu suất phản ứng phân hủy CaCO₃
Câu 4: Có thể điều chế được bao nhiêu kg nhôm từ 1 tấn quặng boxit chứa 95% Al₂O₃. Hiệu suất phản ứng là 98%
Câu 5: Cho 1 quặng boxit có chứa 40% Al₂O₃. Để có được 4 tấn nhôm nguyên chất cần bao nhiêu tấn quặng. Biết hiệu suất phản ứng là 90%

Còn nữa, em vẫn chưa hiểu lắm về phần hiệu suất thì nếu ai giỏi thì chỉ lại cho em được không?

1348 cá luôn

Huỳnh Đức Lê sai rồi 6 mới đúng

1) She got very angry but later she apologize for her_patience____.(patient)

Complete the second sentences so that it has the similar meaning to the first one.

2) Somebody has suggested abolishing income tax.

->It__has been suggested to be abolished______

624 : 3 - 324 : 3

= ( 624 - 324 ) : 3

= 300  : 3

= 100

k nha