[多选题]作为洞室围岩,层状岩体常见的变形与破坏形式有A、 脆性破裂 B、 弯曲折断C、 松动解脱D、 塑性变形和膨胀
[单选题]对调幅波进行解调还原出调制信号的过程是( ).A、 检波B、 调频C、 鉴频D、 调制
[填空题]出口企业应在办理对外贸易经营者备案登记或签订首份委托出口协议之日起( )内,办理出口退( )税资格认
[单选题]绘制下图,并回答问题.将绘图精度设置为小数点后四位,图中D区域的周长为A、172.1330 B、172.1320 C、172.1335 D、172.1030
[填空题]下列各项中,应通过“营业税金及附加”科目核算的是( )
[阅读理解]When Dr. Robert Metcalf first used a solar cooker, the future changed for millions of Africans. He knew that billions of poor people around the world depend on the use of wood for cooking. As they take more and more firewood from wild areas. They are destroying habitats around the world. Wood collection is one reason why many animals have become endangered.“But sunshine can be an alternative to fire.” Dr. Metcalf says. Since his first solar cooked meal, he has helped people around the world to use simple new technologies to cook their food.Each morning in villages across East Africa, small children and their mothers wake up and walk several miles to collect firewood to cook their food. It takes much of the day, and the heavy firewood they carry home on their heads lasts only a few days.This is why Dr. Metcalf spends each summer in Africa. He teaches women and children in villages how to cook with the sun. So far, more than thirty thousand African families now have solar cookers, and new programs will introduce solar cookers to millions of families.To find water, women and children may have to walk long distance to dig holes in dry riverbeds or to gather water from streams and shallow wells.They fill their buckets(桶)and carry them home on their heads. The buckets often weigh asmuch as forty pounds. Not only is finding water hard work, but the water is often polluted withgerms(细菌)that make people sick.Dr. Metcalf and others developed a simple,reusable tool that people can use to make sure their water is safe to drink.The tool is calked a WAPI,which stands for “Water Pasteurization Indicator”. The pasteurization process is named after Louis Pasteur,who developed it in the 1800s.1.Why did Metcalf help Africans use solar cookers?回答A.He wanted to help them to fight poverty.B.He found it a dangerous job to collect firewood.C.He realized using firewood is not good for the environment.2.The underlined word “it” in the third paragraph probably refers to回答.A.collecting firewood B.cooking foodC.cooking with the sun 3.Each summer Metcalf stays in Africa to 回答 .A. do research on waterB. take care of sick peopleC. spread the technique of using solar cookers4.Water Pasteurization Indicator was developed to 回答 .A. kill the bacteria in waterB. honor Louis PasteurC. make waste water reusable 5.It can be inferred from tile passage that 回答 .A.Africans find it hard to learn to use solar cookersB.women and children in Africa usually lead a hard lifeC.the water Africans drink is not clean though it is easy to get
[单选题]在下列关于人工智能的描述中,比较合适的描述是( ).A、人工智能说到底就是人的智能.B、人工智能是机器的意识和思维的信息过程.C、人工智能是人的意识和思维的信息过程.D、人工智能是对人的意识和思维的信息过程的模拟
[判断题]协调是持续健康发展的内在要求.( )
[单选题]推动经济全球化的主体是( ). A、 市场经济 B、 发达国家 C、 跨国公司 D、 发展中国家
[单选题]铁路线路的上部结构不包括A、 道床B、 轨枕C、 钢轨D、 路基
[单选题]公路中线里程桩测设时,短链是指( ).A.实际里程大于原桩号B.实际里程小雨原桩号C.原桩号测错D.以上都不对
[填空题]主矢不等于零,主矩不等于零,这力系可以再简化为
[单选题]接触网( )悬挂的承力索和接触线的走向相反.A、 直链形B、 斜链形C、 半斜链形D、 简单
[单选题]从www.stdu.edu.cn可以看出它是____.A、 中国的一个政府组织站点B、 中国的一个商业组织的站点C、 中国的一个军事部门站点D、 中国的一个教育机构的站点
[问答题]合成乙酰苯胺时,为什么选用韦氏分馏柱
[判断题]对于跟地基没有联系的几何不变体系本身来说,其自由度一定等于3.
[多选题]洋务派举办民用企业的目的是( )A、 解决办军事工业煤铁等原料的需求B、 交通运输的需要C、 企图以民用企业的利润弥补军用工业的亏空D、 求富发展资本主义经济
[单选题]商业银行风险管理中,( )是指揭示与认清风险,分析风险的起因与可能的后果,其准确与否,直接关系到能否有效地防范和控制风险损失.A. 风险识别B. 风险计算C. 风险控制D. 风险衡量
[单选题]自动安平水准仪的特点是( )使视线水平.A.用安平补偿器代替管水准仪B.用安平补偿器代替圆水准器C.用安平补偿器和管水准器.D.以上都不对
[单选题]CPU、存储器、I/O设备是通过______连接起来的.A、 接口B、 总线C、 控制线D、 系统文件
[问答题]简述S700K型电动转辙机的整机传动过程..