主页
学科
搜索
账户
常见问题
当前学科：专业知识考试
题目：
单选题
核电厂在可行性研究勘察阶段时，常规岛区控制性勘探孔深度宜进入基础底面以下基本质量等级为Ⅰ级、Ⅱ级的岩体不少于（）。（）
A
3m
B
5m
C
10m
D
15m
答案：
<查看本题扣1积分>
查看答案
答案不对？请尝试站内搜索
推荐知识点:
采取何种技术措施可以防止循环流化床锅炉水冷管壁的磨损？
钠离子交换器再生时，在一定浓度的盐液中，树脂对NA+的吸取会优先于CA2+、MG2+。（）
公务员适合的房贷还款方式是（）。
黏液样变性是由于组织间质内（）。
患儿9个月，突然高热，烦躁，吃奶后频繁呕吐入院，查体：体温38℃，意识模糊，眼神呆滞，颈有抵抗，前囟隆起。初步考虑哪种疾病（）。
大量氮、磷等植物性营养元素进入水体后，藻类大量繁殖，水质恶化，水生生物死亡，一般称为富营养化。
男性，体重50kg，因食管癌进水不足，口渴明显，唇干，皮肤弹性差，眼窝凹陷。当天需补给多少液体（）。
纵弯褶皱作用
患者女性，35岁，因双眼视力下降伴头痛7天，检查矫正视力VOU0.3，结膜混合充血，角膜羊脂状KP（+），前房闪辉，前房细胞（++），虹膜无粘连，玻璃体混浊（+），视乳头充血，轻度水肿，视网膜后极部神经上皮浅脱离，视网膜血管无扩张，最可能的诊断是（）
By about A. D. 500 the Mound Builder culture was declining, perhaps because of attacks from other tribes or perhaps because of severe climatic changes that undermined agriculture. To the west another culture, based on intensive agriculture, was beginning to flourish. Its center was beneath present day St. Louis, and it radiated out to enclose most of the Mississippi watershed, from Wisconsin to Louisiana and Oklahoma to Tennessee. Thousands of villages were included in its orbit. By about A. D. 700 this Mississippian culture, as it is known to archaeologists, began to send its influence eastward to transform. the life or most of the less technologically advanced woodland tribes. Like the Mound Builders of the Ohio region, these tribes, probably influenced by Meso-American cultures through trade and commerce, built gigantic mounds as burial and ceremonial places. The largest of them, rising in four terraces to a height of one hundred feet, has a rectangular base of nearly fifteen acres, larger than that of the Great Pyramid of Egypt. Built between A. D. 900 and 1100, this huge earthwork faces the site of a palisaded(用栅栏围起的)Indian city which contained more than one hundred small artificial mounds marking burial sites. Spread among them was a vast settlement containing some 30,000 people by current estimations. The finely crafted ornaments and tools recovered at Ca-hokia, as this center of Mississippi culture is called, include elaborate ceramics(陶瓷制品), finely sculpted stonework, carefully embossed and engraved copper and mica(云母)sheets, and one funeral blanket fashioned from 12,000 shell beads. They indicate that Cahokia, was a true urban center, with clustered housing, markets, and specialists in tool-making, hide-dressing patting, jewelry-making, weaving, and salt-making.What is the main topic of the passage? ______A．The Mississippian culture.B．The decline of Mound Builder culture.C．The architecture of Meso-American Indians.D．The eastern woodlands tribes.