属于内脏性疼痛的疾病是 A．胆道结石疼痛 B．血栓闭塞性脉管炎 C．患肢痛 D．腰肌

回收1吨废纸，能造出新纸820千克．一个回收站回收废纸27吨，可以造出新纸多少千克？

某同学在一废旧器材中找到一根合金棒，该同学想测定该合金的电阻率，先利用多用电表粗测其阻值R_x约为5 Ω。实验室备有下列实验器材：  

A．电压表V₁ （量程3V，内阻约为15kΩ）  

B．电压表V₂（量程15V，内阻约为75kΩ） 

C．电流表A₁ （量程3A，内阻约为0.2Ω）  

D．电流表A₂ （量程600mA，内阻约为1Ω）  

E．滑动变阻器R₁（0~100Ω，0.3A） 

F．滑动变阻器R₂（0~2 000Ω，0.1A）  

G．电源E（电动势为3V，内阻约为0.3Ω） 

H．开关S ，导线若干  

(1) 该同学先用游标卡尺测量合金棒的长度L 。图甲中游标卡尺（游标尺上有20个等分刻度）的读数L=____________cm；用螺旋测微器测金属丝的直径如图乙所示，则螺旋测微器的示数是____________mm。

(2)为提高实验精确度，减小实验误差，应选用的实验器材有____________。

(3)为减小实验误差，应选用图丙中____________（填“a”、“b”）为该实验的电路图，并按所选择的电路图把图丁的实物图连接起来。

商业银行建立了一套科学的授信限额管理系统，能够根据客户信息自动授予限额，则在其他条件相同的情况下，该系统不可能发生的情形是（）。

A.客户信用等级越高，限额越高

B.客户所有者权益越高，限额越高

C.客户历史信誉状况越好，限额越高

D.客户资产负债率越高，限额越高

The heart of Mexico is a high, oval valley surrounded by mountains. Once, forests covered the mountainsides, and broad, shining lakes covered nearly all the valley floor. Now, the mountains are bare and scarred with erosion（侵蚀）, and much of the valley floor is dry and dusty.

Cortez and his Spanish soldiers were the first Europeans to enter this valley. They saw the thriving Aztec city of Tenochtitlan rising from an island in one of the lakes. Surrounding it were green floating gardens. The Spaniards said it was as beautiful as a dream. Then the conquest  began. 

By 1521, when the Spaniards had conquered the fierce Aztecs, the island city was in ruins. Cortez decided to rebuild it after the pattern of European cities. Using the conquered Aztecs as slave laborers, Cortez built the new city, now Mexico City, in just four years.

“But a generation had scarcely passed after the conquest before a sad change came over these scenes so beautiful,” writes one historian. The broad, shining lakes began to dry up.

Modern historians believe that Cortez began the destruction of the valley’s lakes when be ordered the city rebuilt. A great deal of charcoal was needed to burn the limestone (石灰石) from which cement (水泥) and mortar were made. Wood was needed to finish the interiors of the buildings.

The mountainside forests were destroyed to provide the charcoal and wood. Once the sloped were bare, rainfall o longer seeped (渗漏) slowly into the earth to feed the springs that filled the valley’s lakes. Instead, rainfall poured off the mountainsides the city from floods, later rulers made a cut through the mountains so that the water drained away into another valley. Mexico City, once an island, had become a city of a dry plain.

小题1:The underlined word “thriving” in the second paragraph means _______.

A．developing successfully

B．increasing

C．failing

D．growing little小题2:Which statement does this article lead you to believe?

Keeping nature’s balance is not important any more.

Men thought nature’s resources would last forever.

New forests always automatically replace old ones.

The Aztecs didn’t begin to flourish until Cortez came.

小题3:Why did later rulers cut through the mountains ?

They wanted to fill the city with rainwater.

They wanted the valleys to flood regularly.

They wanted to plant more trees.

They wanted to protect the city from floods.

小题4: One the whole, the article tells about ______.

Mexico as it looked when it was a European city

Modern historians who write about Mexico City

Mexico city before and after the Spaniards came

The beautiful scenery in Mexico

小题5: What is the author’s purpose of writing this article?

A．To tell the beauty and ugliness of Mexico City

B．To introduce the terrible change of Mexico City

C．To explain how Mexico City changed

D．To make people aware of the importance of nature balance

乙烯装置在投料试车中，温度、压力等参数波动大，对紧固件升温时要热把紧，降温时要冷把紧。