二 　　晶达电子(苏州)有限公司(3205341319)从宁波富瑞电子科技有限公司(

下列哪项不能用作防火分区分隔设施()。

（A）防火墙   

（B）耐火楼板

（C）防火卷帘

（D）挡烟垂壁

Read the following text and choose the most suitable heading from A-F for each paragraph. There is on e extra heading which you do not need.

小题1:

You’re probably most familiar with college dictionaries, often called abridged dictionaries. Although abridged means “shortened”, these dictionaries contain more than 150.000 entries and provide detailed definitions that are sufficient for most college students and general users. College dictionaries also contain separate lists of abbreviations. Biographical and geographical names, foreign words and phrases. And tables of measures. Webster’s Ⅱ New Riverside University Dictionary and the American Heritage Dictionary of the English Language are college dictionaries.

小题2:

unabridged dictionaries contain as many as 500,000 entries and provide detailed definitions and extensive word histories （etymologies）. These dictionaries, possibly in several volumes and mostly found in libraries, are excellent sources for scholarly inquiries. Unabridged dictionaries include the Oxford English Dictionary and the Random House Dictionary of the English Language.

小题3:

A dictionary entry has many elements: multiple definitions, syllabication, preferred spelling and pronunciation （some word have more than one acceptable spelling and pronunciation）, and part-of-speech labels. Some entries also include plurals and capitalized forms. Synonyms, antonyms, and derivatives. Americanisms and etymologies may be provide along with usage notes, cross-references, and idioms.

小题4:

If you prefer using the dictionary on a computer, you can obtain CD-ROM versions of many major dictionaries. In addition, you can access numerous dictionaries, such as WWWebster’s Dictionary, on the Internet. Online dictionaries allow you to enter a search word （you even get help with spelling ） to see a definition, and sometimes even an illustration. Online dictionaries also offer additional features, such as word games. Language tips, and amusing facts about words. Some online dictionary services allow you to access numerous dictionaries, both general and specialized, in on search.

小题5:

Specialized dictionaries provide in-depth information about a certain field. For example there are dictionaries for the specialized vocabularies of law, computer technology, and medicine. In addition, there are dictionaries of synonyms, clichés, slang, and even regional expressions. Such as the Dictionary of American Regional English（DARE）. There are also dictionaries of foreign languages, famous people’s names, literary characters’ names and place names.

鲸蜡

隧道双向开挖接近贯通面时，两端施工应加强联系与统一指挥，当隧道两个开挖工作面距离接近（）m时，必须采取一端掘进另一端停止作业并撤走人员和机具的措施，同时在安全距离处设臵禁止入内的警示标志。

A、10

B、15

C、20

1994年10月23日13时45分，西安庆华电器厂一辆载有140箱、共计105万发雷管的解放牌卡车沿309国道由西向东行驶至山东省平度市洪山乡乡政府所在地附近，突然发生爆炸，造成5人死亡，95人受伤，其中6人重伤，爆点处地面形成一个直径约6米，深约1.9米的爆坑。爆炸冲击波对周围13个村庄造成不同程度的破坏，爆点附近公共建筑、民用住宅遭到严重破坏。距爆点以西240米的邮电局程控电话交换机因高压电线被炸断在通讯线路上而被烧毁，使当地交通、通讯、供电中断，直接经济损失826万元。

请分析事故原因以及应采取的预防措施。