在电控汽油喷射式发动机上，增加发动机混合气浓度常用方法油（）。A、拆去汽油压力调节器

（27分）法国历史学家托克维尔毕生研究的核心问题是个人自由和政治民主问题。阅读下列材料，结合所学知识回答问题。

材料 托克维尔和他的朋友德蒙先生于1831-1832年间赴美国考察监狱制度，后经多年思考，分别于1835年和1840年出版轰动世界的《论美国的民主》第一、二部分。

托克维尔认为民主的成功和失败主要取决于三个因素：一是法律，包括法律、制度、宪法结构等；二是民情，即自由的习惯，包括思想、行为、习惯、价值观等；三是物质的或历史的环境。

——据Schleifer《关于<论美国的民主>新译本的读书报告》整理

（1）托克维尔赴美考察时美国实行什么政体？根据材料和所学知识，指出当时美国民主政治中可能令其着迷和失望的东西有哪些？（6分）

（2）托克维尔认为民主政治受制于哪些要素？按这一说法分析，民主政治为何在19世纪晚期的法国获得成功而在20世纪初期的中国遭遇挫折？（15分）

（3）“有时候 * * 的改良和让步反倒会激发破坏性的革命”被称为“托克维尔悖论”。然而，邓 * * 却以“改革不能太晚”的见识，努力化解这一悖论，试以中国现代化建设新时期的有关史实加以说明。（6分）

Jim is a building contractor. Bob is a builder who works for Jim under a contract of service. Bob is currently engaged in the building works of a multi-storey building, which Jim undertook to erect. Dave is a truck-driver who agreed to provide services to Jim for this particular construction work. Although it is Jim’s responsibility to instruct Dave as to what work needs to be done, Dave is responsible for providing his own machinery and his own assistants.(a) While Bob was working on the multi-storey building, the scaffolding on which he was standing collapsed and Bob fell on the ground. Bob was not wearing the protective helmet, which had been provided by Jim to all the builders. Bob suffered a serious head injury.(b) While Dave was working at the building site, he negligently left one of his trucks switched on and unattended. The truck rolled away from the building site and smashed into Alice’s house, which was right across the street. Alice’s house suffered extensive damage.Required:Advise Jim as to his legal liability in respect of (a) and (b) above. (10 marks)

甲企图杀乙。某日晚见乙的房间有人影晃动，便瞄准射击，结果将在乙家做客的丙打死。甲的行为属于（）

A.客体认识错误

B.手段认识错误

C.对象认识错误

D.法律上认识错误

在下述（）种情况下，系统同一点故障时，单相接地短路电流大于三相短路电流。

A.

B.

C.

D.不确定