败血症（）. A.紫癜伴关节腔出血 B.紫癜伴休克或其他部位广泛严重出血 C.紫癜伴

某补钙保健品的部分标签内容如下．

【主要原料和配料】碳酸钙、维生素D、乳糖、淀粉等

【功效成份】每片中含：钙500mg、维生素D 100IU等

【规格】2.5g/片

【贮藏方法】密闭，置阴凉干燥处

某课外小组利用实验，探究该保健品中是否可能含有碳酸钙．请你帮助他们完成探究报告．实验室提供仪器如下：

猜想：该药品中含有碳酸钙．

设计实验：

序号	实验主要步骤及部分现象
①	选择药品：钙该保健品粉末和________________________； 选择仪器（填序号）：__________________________________．
②	组装仪器，___________________________，装药品．
③	实验开始时，观察到有气泡产生，发生反应的化学方程式为 ___________________________________，收集产生的气体．
④	验满收集气体的方法是_________________________________．
⑤	检验该气体成分的方法是________________________________________， 该化学方程式为_____________________________________________．

结论：根据标签和实验，可初步推断，该药片中可能含有碳酸钙．

如图，用回旋加速器来加速带电粒子，以下说法正确的是

[ ]

A．图中加速器出口射出的是带正电粒子

B．D形盒的狭缝间所加的电压必是交变电压

C．强磁场对带电粒子做功，使其动能增大

D．粒子在加速器中的半径越大，周期越长

事故调查的目的是什么？

Tragedies have a way of making people rethink their (1) and find a new focus. They make people think about what a society needs in order to (2) . The notion of doing something to take control of society or of our fate as humans might be dated back to ancient times of the (3) . Now, in the early 21st century, " social (4) " are trying to take back some (5) over society’s direction once again. A social inventor is not necessarily a social (6) , a social (7) or someone who works in a (8) industry or invents new (9) and consumer products. A social inventor is using the power of (10) thinking, to come up with ideas for (11) in certain communities or sections of society. They have a vision of a (12) world and create new systems or practices. Their ideas may seem (13) or impossible. They are usually quite (14) people. But some of these creative thinkers have (15) and quietly changed the way we live. Social inventions do not have to be (16) . Sometimes they are new (17) for neighborhoods or communities, or even very (18) ideas. The idea of social inventions has become so popular in recent years. It shows how much people desire to make a (19) in our society and not remain (20) .

Tragedies have a way of making people rethink their (1) and find a new focus. They make people think about what a society needs in order to (2) . The notion of doing something to take control of society or of our fate as humans might be dated back to ancient times of the (3) . Now, in the early 21st century, " social (4) " are trying to take back some (5) over society’s direction once again. A social inventor is not necessarily a social (6) , a social (7) or someone who works in a (8) industry or invents new (9) and consumer products. A social inventor is using the power of (10) thinking, to come up with ideas for (11) in certain communities or sections of society. They have a vision of a (12) world and create new systems or practices. Their ideas may seem (13) or impossible. They are usually quite (14) people. But some of these creative thinkers have (15) and quietly changed the way we live. Social inventions do not have to be (16) . Sometimes they are new (17) for neighborhoods or communities, or even very (18) ideas. The idea of social inventions has become so popular in recent years. It shows how much people desire to make a (19) in our society and not remain (20) .

“‘站在前人的肩膀’从事文化创造”这句话的意思是（）

A.科学技术推动着文化的进步

B.思想运动推动着文化的进步

C.教育推动着文化的进步

D.社会实践推动着文化的进步