试题与答案

工程中对钢筋进行冷拉或冷拔加工是为了______。 A．提高钢材强度 B．节约钢材

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题型：多项选择题

题目：

工程中对钢筋进行冷拉或冷拔加工是为了______。

A．提高钢材强度

B．节约钢材

C．提高钢材硬度

D．提高钢材韧性

E．降低钢材硬脆性

答案：

参考答案：A,B

解析：工程中常对钢筋进行冷拉或冷拔加工，以期达到提高钢材强度和节约钢材的目的。钢筋冷拉是在常温下将其拉至应力超过屈服点，但远小于抗拉强度时即卸荷，这样在后期使用时，钢筋的强度有明显的提高。

考点：注册资产评估师建筑工程评估基础建筑工程评估基础
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题型：阅读理解

NASA is moving ahead with plans to put a long-armed lander on Mars’ icy north pole to search for clues①for water and possible signs of life.

The $386 million Phoenix Mars is planned to touch down in the Martian arctic in 2008. The stationary probe will use its robotic arm to dig into the icy land and pick up soil samples②to analyze. In 2002, the Mars Odyssey orbiter spotted evidence of ice-rich soil near the arctic surface.

Scientists hope the Phoenix mission will find clues to the geologic history of water on the Red Planet and determine whether microbes③existed in the ice.

Phoenix will be the first mission of the Mars Scout program, a renewed, low-cost effort to study the Red Planet. “The Phoenix mission explores new territory in the northern plains of Mars analogous to the permafrost regions on Earth,” Peter Smith said.

True to its name, Phoenix rose from the ashes of previous④missions. The lander for Phoenix was built to fly as part of the 2001 Mars Surveyor program. But the program broke down after the well-known disappearance of the Mars Polar Lander in 1999. The Polar Lander lost contact during a landing attempt near the planet’s south pole after its rocket engine shut off prematurely, causing the spacecraft to fall about 130 feet to almost certain destruction.

The Phoenix probe had been in storage at a Lockheed Martin clean room in Denver before it was reused for its present mission. It will carry science instruments that were designed for the Mars Surveyor program including an improved panoramic camera and a trench-digging robotic arm. Phoenix will lift off from the Kennedy Space Center in August 2007 and land on the planet nine months later.

Notes:

①    clue  n. 线索

②    sample  n. 标本，样品

③    microbe  n. 微生物

④    previous  adj. 先前的

小题1:The passage mainly tells readers that _________.

A．clues of water will be found in Phoenix

B．Phoenix will be sent to find clues of water on Mars

C．August 2007 will see Phoenix lift off

D．the Mars Scout program will be carried out小题2: The underlined word “prematurely” (paragraph 5) means _________.

A．on time

B．behind the time

C．out of work

D．ahead of time小题3: According to the passage, we know Phoenix will land on Mars _________.

A．in May 2008

B．in August 2007

C．in August 2008

D．in September 2008小题4: According to the passage, the name “Phoenix” is after the meaning of _________.

A．rebirth

B．death

C．energy

D．hope小题5:After Phoenix lands on Mars, we can infer it will firstly _________.

A．find soil samples and send them to the earth

B．look for the icy land to dig for the soil samples

C．take photos and send them to the earth

D．find the remains of the Mars Polar Lander
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