冷拉后的钢筋，再做拉伸实验，则（）。 A.屈服强度降低，塑性和韧性提高 B.屈服强度
题型：单项选择题
问题：
冷拉后的钢筋，再做拉伸实验，则（）。
A.屈服强度降低，塑性和韧性提高
B.屈服强度提高，塑性和韧性提高
C.屈服强度降低，塑性和韧性降低
D.屈服强度提高，塑性和韧性降低
题型：单项选择题
下面是几篇有关户外运动的信息, 请阅读下列资料和相关信息, 并按照要求匹配信息。首先, 请阅读下列有关户外活动的资料介绍:
a. Baja offers you exceptional scuba diving, snorkeling, kayaking, and sportfishing. While it the most water- based trip by far, it still offers you some amazing biking and hiking amongst the surrounding hills, not to mention delicious Mexican cuisine
b. Immerse yourself in the natural and cultural abundance of Cape Cod by alternating days of biking the scenic Cape Cod Rail Trail with leisurely days spent on the water kayaking, whale watching, and cruising to Nantucket Island. You’ll also get to enjoy the region’s finest fare.
c. Explore one of the most beautiful national parks in the United States! Our Death Valley adventure offers you an array of spectacular vantage points for the park’s more than 3.3 million acres of dramatic desert scenery, rare desert wildlife, and unique historical and cultural sites. You can spend your days hiking and stunning desert canyons.
d. We also host social events and participate in community activities and charitable events. Club activities are mostly in the Redding, Mt. Lassen, and Mt. Shasta areas? But, we also put on out- of - town, multi - day events that involve travel to the Coast, Oregon, Vancouver Island, British Columbia, and Utah.
e. Join thousands of runners on November 5th for the 5th Anniversary of the Original US Half Marathon, San Francisco. Meet us on Historic Muni Pier for this flagship event across the Golden Gate Bridge!
f. On October 21, 1,700 of the world’s best athletes will race on the lava fields of Kona, Hawaii at the Ford Ironman World Championship. Ten of these athletes will be CEOs that qualified at various Ironman races around the world for the right to compete for the title of Fittest CEO’.
请阅读以下运动爱好者的信息, 然后匹配参与者和他/ 她拟要参与的项目:
1. Beckham, a gentleman with wide interests, has been to a number of places of interest but never has he been to a real desert.
2. Rodecia, also a sports lover, is a disabled young man. But he spends his time watching, reading or talking about events of close competitions.
3. Bobage, who often goes in for world traveling and mountain climbing, is now planning to start out again.
4. Webster, a strongly- built young man, is interested in all kinds of sports. He is especially crazy about outdoor adventure and water sports.
5. Maria, a girl full of energy, is both a sports lover and a wildlife lover who has a special interest in the sea.
参与者项目
1. Beckham
A．water lover paradise
2. Rodecia
B．Cape Cod
3. Bobage
C．Death Valley
4. Webster
D．Club activities5. Maria E. US Half Marathon
F. Ironman World Championship