读下面四幅图片回答问题。 （1）图中分别代表的少数民族是： A_______族；

关于CT增强扫描，说法错误的是（）

A.常规增强扫描常用于颅脑的扫描，对对比剂的注射速率要求严格

B.肝动脉供血的时相扫描称为肝动脉期扫描

C.不同的时相扫描需要设定不同的扫描时间

D.小剂量试验常用于寻求造影剂的峰值时间，寻找最佳延迟时间

E.CT值监测激发扫描能保证精确的扫描延迟时间

老年女性，65岁，查体B超发现左肾小来诊。查体：BP160／90mmHg，心肺腹（－），眼睑、双下肢无浮肿，肾脏超声示右肾10cm×5cm×3.5cm，皮质厚度1.5cm，左肾8.5cm×4.5cm×3cm，皮质厚度1.3cm，皮髓质交界不清。

如果该病人既往间断腰痛、乏力20余年，夜尿增多2年，无特殊用药史，血常规示轻度贫血，肾功示BUN10.6mmol／L，Cr180μmol／L，尿常规示Pro（＋），Glu（＋），红细胞1～2个／HP，WBC10个／HP，肾血管超声未见异常，眼底检查示眼底动脉变细，无渗出，诊断考虑哪种病可能性大（）

A.慢性肾小球肾炎

B.高血压病损害

C.先天性肾发育不全

D.慢性肾盂肾炎

E.肾动脉狭窄

F.马兜铃酸肾病

In the current immigration wave, something markedly different is happening here in the middle of the great American "melting pot." (46) There is a sense that, especially as immigrant populations reach a critical mass in many communities, it is no longer the melting pot that is transforming them, but they who are transforming American society.

American culture remains a powerful force—for better or worse—that influences people both here and around the world in countless ways. But several factors have combined in recent years to allow immigrants to resist, if they choose, the Americanization that had once been considered irresistible.

In fact, the very concept of assimilation is being called into question as never before. (47) Some sociologists argue that the melting pot often means little more than "Anglo conformity" and that assimilation is not always a positive experience—for either society or the immigrants themselves. And with today’s emphasis on diversity and ethnicity, it has become easier than ever for immigrants to avoid the melting pot entirely. Even the metaphor itself is changing, having fallen out of fashion completely with many immigration advocacy and ethnic groups. They prefer such terms as the "salad bowl" and the "mosaic," metaphors that convey more of a sense of separateness in describing this nation of immigrants.

(48) Among socially conservative families such as the Jacintos, who initially moved to California from their village in Mexico’s Guanajuato state, then migrated here in 1988 to find jobs in the meatpacking industry, bad influences are a constant concern. They see their children assimilating, but often to the worst aspects of American culture.

Their concerns reflect some of the complexities and ambivalence that mark the assimilation process these days. Immigrants such as the Jacintos are here to stay but remain wary of their adoptive country. According to sociologists, they are right to be concerned.

"If assimilation is a learning process, it involves learning good things and bad things," said Ruben G. Rumbaut, a sociology professor at Michigan State University. "It doesn’t always lead to something better."

The ambivalence of assimilation can cut both ways. Many native-born Americans also seem to harbor mixed feelings about the process. (49) As a nation, the United States increasingly promotes diversity, but there are underlying concerns that the more emphasis there is on the factors that set people apart, the more likely that society will end up divided.

With Hispanics, especially Mexicans, accounting for an increasing proportion of U.S. population growth, it is this group, more than any other, that is redefining the melting pot.

Hispanics now have overtaken blacks as the largest minority group in Nebraska and will become the biggest minority in the country within the next seven years, according to Census Bureau projections. (50) The nation’s 29 million Hispanics, the great majority of them from Mexico, have thus become the main focus for questions about how the United States today is assimilating immigrants, or how it is being transformed.

(47) Some sociologists argue that the melting pot often means little more than "Anglo conformity" and that assimilation is not always a positive experience—for either society or the immigrants themselves.

数据库设计中，用E-R图来描述信息结构但不涉及信息在计算机中的表示，它属于数据库设计的______。

A．需求分析阶段
B．逻辑设计阶段
C．概念没计阶段
D．物理设计阶段

35KV及以上电力线路的电杆內缘至线路中心的水平距离不小于杆高加（）mm。

A、2440

B、3100

C、3500