关于遗传性球形红细胞增多症的描述，下述哪一项是正确的（）_血液系统疾病_全学科试题题库

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关于遗传性球形红细胞增多症的描述，下述哪一项是正确的（）
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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.

突触前膜与突触后膜之间的间隙大约是（）.

制动器主要由（）和（）两部分组成

采用焊接时，焊接后芯线绝缘应无烫伤、开裂及后缩现象，绝缘层离开端子边缘露铜不得大于（）。

红外星

患者，男性，26岁，因脑震荡急诊入院，病人呈睡眠状态已3天，可以唤醒随后入睡，可以回答问题，但有时不正确，请判断病人意识状态处于何种情况（）。

患儿，10个月，消瘦，生长发育不及正常同龄儿童。口、鼻、眼、肛门等皮肤黏膜交界处皮损2个月。皮损以水疱、脓疱为主，四肢末端出现类似银屑病样皮损，头发、眉毛、睫毛稀少，伴有腹泻。血电解质提示Zn低于正常水平。其父母体健。有关此病的治疗应除外（）

象限角

我行目前定义的睡眠户是指（）个月未登录个人网上银行的客户。

不符合慢性粒细胞白血病的是（）