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The hunt for the Malaysia Airlines jet has become the most expensive maritime search operation that China has been involved in, according to experts.

"China is the nation that has sent the largest group of ships and aircraft to the search," said Wang Ya'nan, deputy editor-in-chief of Aerospace Knowledge magazine.

"Therefore, we can be sure that the nation must have become the biggest spender in the operation, although no official figures are available."

Wang said the costs for fuel and wear on equipment are basically identical for China and Western nations, so it only takes some simple calculations to assess the amount spent by each nation based on the scale of their involvement in the search.

China's military has not disclosed how much it has spent on the far-flung, month long search. Defense Ministry spokesman Geng Yansheng sidestepped a question on the issue at a news conference on March 27.

China, home to the majority of the 239 people on board the Boeing 777-200, has sent 18 ships, eight helicopters and three fixed-wing aircraft to various search areas.

Liu Jianping, a military expert, told the newspaper that the costs for vessels include fuel, water, food, medicine, salaries and subsidies for personnel. The vessels need constant maintenance and incur significant depreciation costs, he added.

At least $44 million has already been spent on the deployment of military ships and aircraft in the Indian Ocean and South China Sea by China, Australia, the United States and Vietnam, Reuters estimated in a report. This does not cover all the defense assets being used by countries including Britain, New Zealand and South Korea.

The figure already matches the 32 million euros ($44 million) spent in searches lasting several months spread over two years for an Air France jet that crashed into the Atlantic Ocean in 2009.

Last week, the US Department of Defense said it had already spent more than $3.3 million on the search and planned to nearly double its original $4 million budget.

Insiders say it is difficult to come up with a full estimate for the search, especially as many of the costs are a routine part of maintaining search-and-rescue capabilities.

Questions:

1. Which nation has sent the largest group of ships and aircraft to search for Malaysia Airlines Flight 370?

2. How many helicopters has China sent to assist with the search?

3. Who is Liu Jianping?

Answers:

1. China.

2. Eight.

3. A military expert.

（中國日報網英語點津 Helen 編輯）

About the broadcaster:

Anne Ruisi is an editor at China Daily online with more than 30 years of experience as a newspaper editor and reporter. She has worked at newspapers in the U.S., including The Birmingham News in Alabama and City Newspaper of Rochester, N.Y.