(1) 是操作系统中可以并发工作的基本单位，也是核心调度及资源分配的最小单位，它由

请你参与下列探究：

（1）[ 问题情景] 某化学实验小组同学将铁粉投入硫酸铜溶液中，发现生成红色固体物质的同时有较多的气泡放出。同学们都能解释红色固体物质的出现，请你写出生成红色固体物质的化学反应方程式                                  。但却对气体的生成产生了疑问，这激发了同学们强烈的探究欲望，生成的是什么气体？

[ 提出猜想] 从物质组成元素的角度，放出的气体可能是O₂、SO₂、H₂。

[ 查阅资料]SO₂易溶于水，它能与过量的NaOH 溶液反应，生成Na₂SO₃。

（2）[ 方案设计] 依据上述猜想，实验小组同学分别设计了如下方案：

①甲同学认为是O₂，则较简单的检验方法是                                   。

②乙同学认为是SO₂，则只需将放出的气体通入盛有NaOH 溶液的洗气瓶中，称量通气前后洗气瓶的质量。写出SO₂与过量的NaOH 溶液反应的化学方程式                                          。

③甲、乙同学实验的结果表明气体中既不含O₂也不含SO₂。丙同学根据以上实验结果推测气体是H₂。

[ 实验探究] 丙同学为了检验H₂，收集了一试管气体，用拇指堵住试管口且管口略向下倾斜靠近火焰移开拇指点火，听到很小的声音。然后再将气体用带尖嘴的导管导出点燃且用冷而干燥的烧杯罩在火焰上方，气体在空气中安静的燃烧，产生淡蓝色火焰，烧杯壁上有水珠生成，接触烧杯的手能感觉到发热。

（3）[结论]：铁粉与硫酸铜的溶液反应时，产生的气体是           。

（4）[ 思维拓展] 由上述实验可以推出，硫酸铜溶液中可能含有            物质。

社会治安综合治理的实施力量是综合性的。既要发挥公安、检察、审判、司法行政、国家安全等专门机关的骨干作用和职能作用，更要发挥各部门、各系统、各社会团体、各群众组织以及广大人民群众的积极作用。 ( )

Washington: The Bush administration has ________for the first time that it may be willing to ________a multinational force in Iraq to operate under the ________of the United Nations as long as ________by an American. The idea was described by Richard L. Armitage, the deputy secretary of state, as just "________" in discussions at the United Nations. It was first ________publicly last week by Kofi Annan, the United Nations’’ secretary general.Mr. Armitage’’s remarks, made ________to regional reporters and released by ________today, represent ________in course for the administration, which has until now insisted that all ________matters in Iraq remain under total American control. Allowing the United Nations ________would be intended to win the support of the Security Council for ________authorizing the ________ occupation of the country.In his remarks, Mr. Armitage ________to discuss the plans________, saying, "I don’’t think it helps to ________publicly right now." But he described the arrangement under consideration as "a multinational force________" in which "the American would be the U.N. commander."On Monday, Defense Secretary Donald H. Rumsfeld was asked whether he could ________American troops fighting_______. His answer: "I think that’’s not going to happen." But he went on to rule out only "________" meaning by the United Nations, whose troops wear blue helmets over a peacekeeping force in Iraq.

心绞痛发作的典型部位是（）

A.心尖区

B.心前区向左上臂放散

C.胸骨下段后

D.胸骨上中后

E.剑突下

什么用来防止金属粒子进入滑油回油泵：（）.

A.一个主金属屑探测器

B.回油滤

C.6个磁性金属屑探测器及油滤