Rocks which have solidified directly
from molten materials are called igneous rocks. Igneous rocks are commonly
referred to as primary rocks because they are the original source of material
found in sedimentaries and metamorphics. Igneous rocks compose the greater part
of the earth’s crust, but they are generally covered at the surface by a
relatively thin layer of sedimentary or metamorphic rocks. Igneous rocks are
distinguished by the following characteristics: (1) they contain no fossils; (2)
they have no regular arrangement of layers; and (3) they are nearly always made
up of crystals. Sedimentary rocks are composed largely of minute fragments derived from the disintegration of existing rocks and in some instances from the remains of animals. As sediments are transported, individual fragments are assorted according to size. Distinct layers of such sed A. is the result of volcanic action B. is crystalline in structure C. was built up over a period of years D. is metamorphic [多选题]晶体管电路分为哪些类型()
A.线型晶体管电路 B.非线型晶体管电路 C.截至晶体管电路 D.普通晶体管电路 [单选题]安全电压决定于()。
A.工作环境和设备额定电压 B.人体允许电流和人体电阻 C.性别和工作环境 [多选题]根据《工程勘察设计收费管理规定》,以下设计项目中应计入基本设计费的是()。
A.编制初步设计文件 B.施工图设计文件技术交底 C.设计单位参加试运考核 D.编制初步设计概算 E.编制施工图预算 [单项选择]中国在《可再生能源中长期发展规划》中明确提出,到2010年和2020年,中国的可再生能源将分别占一次能源消费的10%和()。
A. 15% B. 20% C. 25% D. 30% [判断题]作业人员或施工器具与20.35 千伏带电线路的最小距离应为5m。
A.正确 B.错误 [填空题]列车在80Km/h时施加紧急制动的停车距离是()。
[多项选择]信用卡“三亲见”()。
A. 亲见申请人本人 B. 亲见身份证件原件 C. 亲见申请人签名 [名词解释]雌雄同柱
[单项选择]The effect of the baby boom on the schools helped to make possible a shift in thinking about the role of public education in the 1920’s. In the 1920’s, but especially in the Depression of the 1930’s, the United States experienced a (31) birth rate. Then with the prosperity (32) by the Second World War and the economic boom that followed, young people married and (33) households earlier and began to (34) larger families than had their (35) during the Depression. Birth rates rose to 102 per thousand in 1946, 106.2 in 1950, and 118 in 1955. (36) economics was probably the most important (37) , it is not the only explanation for the baby boom. The increased value placed (38) the idea of the family also helps to (39) this rise in birth rates. The baby boomers began streaming (40) the first grade by the mid-1940s and became a (41) by 1950. The public school system suddenly found itself (42)
A. Since B. Despite C. Although D. Unless [判断题]《高速铁路技术管理规程》第44条规定:轨距是钢轨头部踏面下16mm之处两股钢轨工作边之间的最小距离。直线轨距标准为1435mm。
A.正确 B.错误 [简答题]了解中国恢复在联合国合法席位和中关建交等史实,知道中国独立自主的和平外交政策。(2)课文摘录:万隆会议,又称第一次亚非会议,召开于1955年4月18日-4月24日,是部分亚洲和非洲的第三世界国家在印度尼西亚万隆召开的国际会议,也是有史以来亚非国家第一次在没有殖民国家参加的情况下讨论亚非事务的大型国际会议,主要讨论了保卫和平,争取民族独立和发展民族经济等各国共同关心的问题。万隆会议期间,某些原殖民主义和帝国主义国家利用一些国家制造纷争和矛盾.并对中国发出诋毁性言论,企图分裂会议。周恩来提出“求同存异”方针。在中国和大多数与会国努力下.会议一致通过了包括经济合作、文化合作、人权和自决、附属地人民问题和关于促进世界和平和合作宣言等部分的《亚非会议最后公报》,确定了指导国际关系的10项原则。要求:根据《义务教育历史课程标准(2011版)》要求的课文内容,设计出相关的教学过程,包括教学环节、教师活动和学生活动。(根据下列材料设计教学片段:(1)《义务教育历史课程标准(2011年版)》要求)
[判断题]GTMUC可以插到BBU5900里面
A.正确 B.错误 [简答题]
[听力原文]11-15 [简答题]井下探放水钻孔的布置应遵循哪些原则?
[单项选择]The need for solar electricity is clear. It is safe, ecologically sound, efficient, continuously available, and is has no moving parts. The basic problem with the use of solar photovoltaic devices is economics, but until recently very little progress has been made toward the development of low-cost photovoltaic devices. The larger part of research funding has been devoted to study of single-crystal silicon solar cells, despite the evidence, including that of the leading manufacturers of crystalline silicon, that the technique holds little promise. The reason for this pattern is understandable and historical. Crystalline silicon is the active element in the Very successful semiconductor industry, and virtually all of the solid state devices contain silicon transistors and diodes. Crystalline silicon, however, is particularly unsuitable to terrestrial solar cells.
Crystalline silicon solar cells work well and are successfully used in the space program, where cost is not an issue. Wh A. Solar and extraterrestrial. B. Photovoltaic devices and solar cells. C. Crystalline silicon and amorphous materials. D. Amorphous materials and higher efficiencies. [填空题]非准位隐患的具体位置不明确,有时()很广,危害也很大。
[单选题] 精度是根据仪表的( )来划分的。
A.引用误差 B.系统误差 C.绝对误差 D.相对误差 [多选题]下列( )场所,不宜选择点型离子感烟火灾探测器: ( )
A.产生醇类、醚类、酮类等有机物质 B.相对湿度度经常大于95% C.气流速度大于 5m/s D.高海拔地区 [单项选择]设计铸造圆角的目的是有利于()。
A. 防止浇不足 B. 防止铸件产生裂纹 C. 防止铸件缩孔 D. 防止粘砂 [判断题]1、国务院部门规章可以设定经常性行政许可。
A.正确 B.错误 [单选题]下列关于唐朝均田制的描述,不正确的是( )。
A.和隋代相比,增加了对杂户、官户、工商业者和僧道的授田 B.取消了对妇女、奴婢、部曲的授田 C.触动了地主官僚的私有土地 D.法令上允许买卖口分田 我来回答: 提交
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