若三角形ABC中,角A,B,C的对边分别为a,b,c,则表达式的值为()。 A.A

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问题:

若三角形ABC中,角A,B,C的对边分别为a,b,c,则表达式的值为()。

A.A

B.B

C.C

D.D

考点:在职联考GCT(数学)三角学、平面解析几何(一)
题型:单项选择题

分析下表可以得出的结论是:

一些介质中的声速v(m/s)

空气(15℃) 340海水(25℃) 1531
空气(25℃) 346铜(棒)(25℃) 3750
软木 500大理石(25℃) 3810
煤油(25℃) 1324铅(棒)(25℃) 5000
蒸馏水(25℃) 1500铁(棒)(25℃) 5200
(1)______;

(2)______;

(3)______.

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60周年国庆节,我国在 * * 广场举行盛大的阅兵仪式,战斗机以相同的速度列队飞过 * * .那时以 * * 城楼为参照物战斗机是______的,以任意一架战斗机为参照物,其他战斗机是______的.(填“运动”或“静止”)

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下列与温度有关的叙述中正确的是(   )

A.在扩散现象中,温度越高,扩散进行得越快

B.布朗运动随着温度的降低而越加剧烈

C.分子的无规则运动与温度无关

D.温度越高,分子的无规则运动就越激烈

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A few years ago, Paul Gerner began to gather a group of architects in Las Vegas to ask them what it would take to design a public school that used 50 percent less energy, cost much less to build and obviously improved student learning. “I think half of them fell off their chairs,” Gerner says.

Gerner manages school facilities (设施) for Clark County, Nevada, a district roughly the size of Massachusetts. By 2018, 143,000 additional students will enter the already crowded public-education system. Gerner needs 73 new schools to house them. Four architecture teams have nearly finished designing primary school prototypes (样品); they plan to construct their schools starting in 2009. The district will then assess how well the schools perform, and three winners will copy those designs in 50 to 70 new buildings.

Green schools are appearing all over, but in Clark County, which stands out for its vastness, such aggressive targets are difficult because design requirements like more natural light for students go against the realities of a desert climate. “One of the biggest challenges is getting the right site orientation (朝向),”Mark McGinty, a director at SH Architecture, says. His firm recently completed a high school in Las Vegas. “You have the same building, same set of windows, but if its orientation is incorrect and it faces the sun, it will be really expensive to cool.”

Surprisingly, the man responsible for one of the most progressive green-design competitions has doubts about ideas of eco-friendly buildings. “I don’t believe in the new green religion,” Gerner says. “Some of the building technologies that you get are impractical. I’m interested in those that work.” But he wouldn’t mind if some green features inspire students. He says he hopes to set up green energy systems that allow them to learn about the process of harvesting wind and solar power. “You never know what’s going to start the interest of a child to study math and science,” he says.

小题1:How did the architects react to Gerner’s design requirements?

A.They lost balance in excitement.

B.They showed strong disbelief.

C.They expressed little interest.

D.They burst into cheers.小题2:Which order of steps is followed in carrying out the project?

A.Assessment — Prototype — Design — Construction.

B.Assessment — Design — Prototype — Construction.

C.Design — Assessment — Prototype — Construction.

D.Design — Prototype — Assessment — Construction.小题3:What makes it difficult to build green schools in Clark County?

A.The large size.

B.Limited facilities.

C.The desert climate.

D.Poor natural resources.小题4:What does Gerner think of the ideas of green schools?

A.They are questionable.

B.They are out of date.

C.They are advanced.

D.They are practical.

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何谓玻璃的淬火(又称物理钢化)?

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