根据资料 (1) 和 (2), 当月甲公司计算的材料成本差异率为 (    )。

[A] In December of 1869, Congress appointed a commission to select a site and prepare plans and cost estimates for a new State Department Building. The commission was also to consider possible arrangements for the War and Navy Departments. To the horror of some who expected a Greek Revival twin of the Treasury Building to be erected on the other side of  the White House, the elaborate French Second Empire style design by Alfred Mullett was selected, and construction of a building to house all three departments began in June of 1871.

[B] Completed in 1875, the State Department’s south wing was the first to be occupied, with its elegant four-story library (completed in 1876), Diplomatic Reception Room, and Secretary’s office decorated with carved wood, Oriental rugs, and stenciled wall patterns. The Navy Department moved into the east wing in 1879, where elaborate wall and ceiling stenciling and marquetry floors decorated the office of the Secretary.

[C] The State, War, and Navy Building, as it was originally known, housed the three Executive Branch Departments most intimately associated with formulating and conducting the nation’s foreign policy in the last quarter of the nineteenth century and the first quarter of the twentieth century--the period when the United States emerged as an international power. The building has housed some of the nation’s most significant diplomats and politicians and has been the scene of many historic events.

[D] Many of the most celebrated national figures have participated in historical events that have taken place within the EEOB’s granite walls. Theodore and Franklin D. Roosevelt, William Howard Taft, Dwight D. Eisenhower, Lyndon B. Johnson, Gerald Ford, and George H. W. Bush all had offices in this building before becoming President. It has housed 16 Secretaries of the Navy, 21 Secretaries of War, and 24 Secretaries of State. Winston Churchill once walked its corridors and Japanese emissaries met here with Secretary of State Cordell Hull after the bombing of Pearl Harbor.

[E] The Eisenhower Executive Office Building (EEOB) commands a unique position in both the national history and the architectural heritage of the United States. Designed by Supervising Architect of the Treasury, Alfred B. Mullett, it was built from 1871 to 1888 to house the growing staffs of the State, War, and Navy Departments, and is considered one of the best examples of French Second Empire architecture in the country.

[F] Construction took 17 years as the building slowly rose wing by wing. When the EEOB was finished, it was the largest office building in Washington, with nearly 2 miles of black and white tiled corridors. Almost all of the interior detail is of cast iron or plaster; the use of wood was minimized to insure fire safety. Eight monumental curving staircases of granite with over 4,000 individually cast bronze balusters are capped by four skylight domes and two stained glass rotundas.

[G] The history of the EEOB began long before its foundations were laid. The first executive offices were constructed between 1799 and 1820. A series of fires (including those set by the British in 1814) and overcrowded conditions led to the construction of the existing Treasury Building. In 1866, the construction of the North Wing of the Treasury Building necessitated the demolition of the State Department building.

【背景资料】 A 公司中标城市轨道工程，工程从 K108+735.82m-K111+11.57m，包括暗挖隧道与明挖车站两座，车站 规模分别为 180m×50m 和 160m×50m（长×宽）。工程地质资料显示，本工程地质条件复杂，隧道穿越地 带部分有地下水，且其中一段地层含有沼气。项目部确定坍塌、爆炸、触电、机械伤害为主要风险源。
项目部在暗挖隧道施工方案中对①隧道开挖、②隧道柔性防水、③隧道前方土体加固、④喷射混凝土、 ⑤二次衬砌等工程做为本次施工的重点。初期支护稳定后，进行柔性放水的施工。为保证柔性防水的质量， 柔性防水层缝隙采用专用热合机焊接。
在隧道与车站衔接位置采用长管棚支护，公司管棚施工方案确定管棚长度为 14m，采用 DN100 钢管， 钢管长度 6m，项目部编制管棚施工工艺流程为①施工准备→②测放孔位→③钻机就位→④□→⑤压入钢管 →⑥注浆（向钢管内或管周围土体）→⑦□→⑧养护→⑨开挖。
隧道开挖过程中，施工单位采用环形开挖留核心土法开挖，该方法包括以下工序：①上台阶环形开挖； ②核心土开挖；③上部初期支护；④左侧下台阶开挖；⑤右侧下台阶开挖；⑥左侧下部初期支护；⑦右侧 下部初期支护；⑧仰拱开挖、支护。部分工序位置如图 2 所示。

施工单位在开工前编制了安全技术措施，在安全技术措施中包含施工总平面图，在图中对危险的油库、 易燃材料库等位置按照施工要求和安全操作规程明确定位。

某选矿厂日处理量为450t。尾矿库为山谷型，原设计初期坝高20m，后期坝采用上游法尾矿筑坝，堆积坡比为1：5，并设排渗设施。堆积高度16m，总坝高36m，总库容2.8x 10⁴m³。投入运行前未经论证进行了改址，此后未经论证、设计，擅自加高扩容，采用土石料按1：1.5坡比向上游推进，实施了 3次加高增容工程，总坝高50m，总库容约10.5x10⁴m³。
第三次加高后，该选矿厂对尾矿库安全生产现状进行评价，并出具安全评价报告，评价结论为“该尾矿库是由具有资质的单位设计，坝址选择不合理，尾矿坝调洪库容不足，排洪系统部分堵塞，坝体存在浅层滑动迹象，尾矿库有渗透破坏危险，经过评价该尾矿库为险库，存在重大安全隐患，并提交了重大隐患报告”。
但该矿厂未对此次评价给予重视，未采取处理措施。由于生产需要，其又开始进行第4次加高扩容，采用土石料向库内推进10m，加筑4m高子坝一道，子坝施工至最大坝高处突发坝体失稳溃决，流失尾矿浆约1.5x10⁴m³，造成17人失踪，5人受伤，摧毁民房76间，同时流失的尾矿浆还含有超标氰化物对环境造成了污染，经采取应急措施后得到控。
为保证矿山安全生产，该矿山举行安全生产月安全大检查活动，对企业的安全管理机构是否有效落实安全生产制度和操作规程及执行情况、组织安全培训情况、特种作业人员是否持证上岗等情况进行检查，经过排查发现该企业安全生产许可证已经过期。
根据以上场景，回答下列问题（共22分）：

为适应联合作战需要，世界各国军队采取了如下做法：（     ）

在人数不确定的代表人诉讼中，其代表人是如何产生？（     ）

（背景资料）某项目部承接一项 DN500mm 天然气管线工程，管线全长 2300m，设计压力 0.5MPa，材质 L485。管线主体采用直埋敷设，管线经过公共绿地和 A 公司场院，A 公司院内建筑密集、空间狭窄。

管线局部需穿越道路，道路下面敷设有多种管道。项目部拟在道路两侧各设置 1 个工作坑，其中一个工作坑施工现场平面布置如图 4-1 所示，采用人工挖土顶管施工，顶入 DN1000mm 钢管作为过路穿越套管。穿越道路工程所在区域的环境条件及地下管线平面布置如图 4-2 所示，地下水位于套管管底以下 2m。

4-1工作坑施工现场平面图

图4-2 穿越工程环境条件及地下管线平面布置图

工程开工前，项目部组织人员踏勘了施工现场，调查了地下设施、管线和周边环境，编制了顶管施工专项方案。

清末公布的宪法性文件有（        ）。

企业将应纳资源税的自产矿产品用于产品生产时，应交纳的资源税在利润表“税金及附加”项目中列示。（  ）

2021年下半年，乙公司因资金紧张、经营困难，公司法定代表人张某与公司高管研究决定发行私募债券融资，并安排财务负责人胡某具体负责。为顺利发行债券，张某安排胡某对会计师事务所隐瞒乙公司及张某负债数千万元的重要事实，并提供虚假财务账表、凭证，通过虚构公司销售收入和应收款项、骗取审计询证等方式，致使会计师事务所的审计报告发生重大误差，且在募集说明书中引用审计报告。2022年5月，乙公司在某证券交易所骗取5000万元中小企业私募债券发行备案，并在当年内分两期完成发行。乙公司获得募集资金后，未按约定用于公司生产经营，而是用于偿还公司及张某所欠银行贷款、民间借贷等，致使债券本金及利息无法到期偿付，造成投资者重大经济损失。

【背景资料】S露天铁矿2010年建成投产，设计年采出矿石1200×10⁴t，采场台阶高度15m，采用Φ250mm及Φ310mm电动牙轮钻机穿孔，非电微差爆破，5m³液压挖掘机铲装，汽车运输。采场生产由P公司总承包。
S露天铁矿优化后的爆破参数为：Φ310mm钻机穿孔，孔深17.5m，单孔爆破面积60~70㎡、填塞长度不小于6m，前排单孔装药量630~700kg 、后排单孔装药量700~840kg，单位炸药消耗量0.68~0.82kg/m³，爆破产生的大块矿岩最大对角线长度小于1.4m，大块率小于0.6%。
2018年12月15日，P公司技术员王某完成-30m平台的爆破设计方案，具体为：4排炮孔，每排10孔，使用Φ310mm钻机穿孔，孔深17.5m，单孔爆破面积约63~66㎡，总爆破体积约38700m³，前排单孔装药量670kg，其余单孔装药量770kg，单位炸药消耗0.77kg/m³。
12月21日，公司钻机班班长赵某安排Φ250mm钻机，按照王某的爆破设计方案确定的孔距和排距，完成-30m平台的穿孔作业，实际平均孔深18.2m。22日实施爆破作业时，前排单孔实际装药量为530kg，其余单孔实际装药量为590kg。
12月23日16时左右，采场遇大雾，能见度不足20m，挖掘机司机张某在22日爆破形成的爆堆下进行铲装作业时，爆堆顶部一对角线长度达2.3m的大块岩石突然滑落，将张某挤伤。 
事故调查发现，事故爆区大块率达8.5%；无S露天铁矿对 公司的相关检查、考核记录；无Φ310mm钻机变更为Φ250mm钻机穿孔的记录；无技术员王某对穿孔作业进行检查的记录。