【单选题】The Smiths______ the Summer Palace three times.
【单选题】化学与社会、生产、生活密切相关。下列说法正确的是
A.
神舟10号飞船所用太阳能电池板的材料是单晶硅
B.
用于制作集成电路板的酚醛树脂是天然高分子化合物
C.
工业上获得大量乙烯、丙烯、丁二烯的方法是石油裂化
D.
日常生活中人们大量使用铝制品,是因为常温下铝不能与氧气反应
【多选题】我国古代建筑中,主要的屋顶形式主要有哪些?
【单选题】According to the professor, why do architects use sketches?
A.
Architects are not clear about the final design at the beginning.
B.
To design large buildings, architects must work in a smaller scale.
C.
Engineers use the architect's sketches to implement the details.
D.
Sketches are used as a record of the stages in development.
【单选题】A commercial customer will soon send out a Request For Pricing (RFP) for a new large database server. Why would a pSeries technical specialist try to influence the customer to base the requirements o...
A.
IBM processor performance does not scale well over 16 ways.
B.
Competitors do not pay for TPC-C certification so results are not available.
C.
IBM servers consistently outperform some other servers on a "per CPU" basis.
D.
IBM prices are lower than competition when like numbers of processors are proposed.
【判断题】统一指画面组合部分的内在联系,具体表现为形态、色彩、材质、技法等的相同或相近。()
【单选题】信息时代产生的大量电子垃圾对环境构成了极大的威胁。某“变废为宝”学生探究小组将一批废弃的线路板简单处理后,得到含70% Cu、25% Al、4% Fe及少量Au、Pt等金属的混合物,并设计出如下制备硫酸铜和硫酸铝晶体的路线: 下列关于铜、铝、铁的说法,正确的是
B.
三种金属久置于潮湿的空气中均能生成氧化物而生锈
C.
三种金属均能与硫反应,分别生成Cu 2 S、Al 2 S 3 、FeS
D.
三种金属的还原性:Al>Fe>Cu;离子的氧化性:Cu 2+ >Fe 3+ >Al 3+