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听力原文: Washington All eyes are focusing on Las Vegas as the sporting goods industry closes in its first true industry gathering in years. The much anticipated spring market will make its debut June 11th to 13th in Las Vegas, and the industry's leading sporting goods companies will be on hand to display their latest gear. The exhibit floor will showcase the latest in, athletic footwear, fitness-related equipment, accessories for fitness, as well as spring teen sports products. 'In today's trade show environment, the marketplace demands that we offer more than just the opportunity to promote new products', explained Tom Cove, president of Sporting Goods Manufacturers Association, 'we're committed to drive the exchange of cutting-edge knowledge and best practices to complement the action on the floor.' Along with many of the industry's most influential brands, a number of groups, associations and media organizations within the sporting goods industry have decided to use the trade show as a business rendezvous. San Francisco Apple today introduced Safari 3, the world's fastest and easiest-to-use web browser for Windows PCs and Macs. Safari has always been the fastest browser on the Mac, and now it's the fastest browser on the Windows, loading and drawing web pages up to twice as fast as Microsoft Internet Explorer 7, and up to 1.6 times faster than Mozilla Firefox 2. Safari 3 features easy-to-manage bookmarks, effortless browsing with easy-to-organize tabs, and a built-in RSS reader to quickly scan the latest news and information. Other Safari features now available to Windows users includes snapback, one-click access to an initial search query, resizable text fields, and private browsing to ensure that information about an individual's browsing history isn't stored. Afghanistan Floods triggered by heavy rain killed 23 people and destroyed scores of houses in Afghanistan's northeastern province of Badakhshan, the provincial governor said on Friday. Authorities were searching for missing people after the flooding, which hit on Thursday night in an area of impoverished and mountainous province near the border with Tajikistan, China, and Pakistan. After years of harsh drought, Afghanistan received much more snow and rain this year. Cuba Two Cuban soldiers tried to hijack a passenger plane to escape to a foreign country with hostages on Monday, but were arrested after killing an unarmed military officer on board, the government said. The soldiers, who had escaped from an army base where they were doing military service, hijacked a bus with passengers, took it to the domestic terminal of Havana Airport, and seized an empty passenger jet before dawn. They killed one of the hostages, an army lieutenant colonel, when he tried to stop the hijacking, but were then captured by a military unit, the government said in a statement. Canada The Royal Canadian Mint unveiled a welcome addition to any piggy bank on Wednesday—a monster gold coin with a face value of I million Canadian dollars that it says is the world's biggest, purest and highest denomination coin. The Canadian mint introduced the mega-coin, which is the size of an extra-large pizza, and weighs in at 100 kilograms alongside the one-ounce gold bullion coins it is mass producing at its Ottawa plant. Originally designed to promote the new one-ounce coins, the colossal coins will be issued in a very limited quantity. While they have a 1 million Canadian dollar face value, the coins are worth twice that amount, given the current gold price of $ 683.30 per ounce. Questions: 6.What is happening in Las Vegas from June 11thto13th? 7.What has Apple introduced today? 8.What happened in Afghanistan's northeastern province of Badakhshan? 9.Which of the following statements is true about the hijacking of a passenger plane in Cuba? 10.What is the current worth of the mega-coin produ
A.
A trade show of the latest sporting goods is on display.
B.
An event for team sports is held with the country's best athletes.
C.
A spring market fair for cutting equipment and accessories is open.
D.
A business rendezvous is scheduled between VIPs and the best athletes.
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【简答题】一等直杆长度为0.43m,横截面面积为300 ,受拉力30kN后,伸长0.2mm,则该杆材料的弹性模量为(__)。
【单选题】发展速度属于
A.
动态相对数
B.
比例相对数
C.
结构相对数
D.
比较相对数
【判断题】两根材料、长度都相同的等直杆,一根的横截面积为【图片】,另一根为【图片】,且【图片】。如图。两杆均受自重作用。则两杆伸长量相等。【图片】
A.
正确
B.
错误
【判断题】两根材料、长度都相同的等直杆,一根的横截面积为A1,另一根为A2,且A2 > A1。如图。两杆均受自重作用。则两杆伸长量相等。
A.
正确
B.
错误
【简答题】发展速度属于( )A. 比例相对数 B. 比较相对数 C. 动太相对数 D. 强度相对数
【单选题】铅直的刚性杆AB上铰接着三根材料相同,横截面面积相同,相互平行的水平等直杆,其长度分别为1、2,和3,,如图5.9所示。今在B端作用一水平的集中力F,若以FN1、FN2、FN3和ε1、ε2、ε3分别表示杆1、2、3的轴力和应变值,给定以下四种情况,正确的为( )。
A.
FN1=FN2=FN3,ε1=ε2=ε3
B.
FN1
C.
FN1=FN2=FN3,ε1
D.
FN1
【单选题】发展速度属于?
A.
比例相对数
B.
比较相对数
C.
动态相对数
D.
强度相对数
【简答题】一长为 l, 横截面面积为 A 的等截面直杆 , 质量密度为 ρ, 弹性模量为 E, 该杆铅垂悬挂时由自重引起的最大应力 σ max =__________, 杆的总伸长 Δl=__________ 。
【判断题】单股铜芯导线连接有直接连接和T形分支连接。( )
A.
正确
B.
错误
【单选题】发展速度属于( )
A.
结构相对数
B.
比例相对数
C.
比较相对数
D.
动态相对数
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