机组氧气压力传感器装在（） A.前校装舱 B.前电子舱 C.副驾驶员后壁板

下列反应的生成物为纯净物的是  

A．CH₄与Cl₂­光照

B．氯乙烯加聚

C．乙烯和氯化氢加成

D．丙烯和氯化氢加成

适量饮酒会使人产生轻松的感觉，是一种享受。

债券上市后发行人应遵循信息披露及持续性义务，其信息披露的基本原则有( )。

A．信息披露内容真实

B．发行人只需披露定期报告

C．证券交易所根据各项法律法规对发行人披露的信息进行审查，对其内容不承担责任

D．发行人的报告在披露前须向证券交易所进行登记

E．发行人的报告在披露前须向中国证监会进行登记

下列关于项目部必须履行合同的内容，正确的是( )。

A．组织施工合同的全面执行

B．遵守《合同法》规定的各项原则

C．发生不可抗力使合同不能履行或不能完全履行时，应依法及时处理

D．履行分包合同时，因分包方过失给发包方造成损失，分包方承担连带责任

E．必须以书面的形式建立施工合同、分包合同、洽商变更关系和记录，并应签字确认

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.

It is more and more usual that users of Information Retrieval (IR) systems must face up to response of hundreds or thousands of (66) documents. A significant proportion of them are moreover (67) or redundant. This is a straight consequence of two well - known facts: the incessant growing of documental databases and the lack of ability of most users to define (68) information needs. In such a framework, further effective retrieval techniques are only part of the solution. Interfaces with alternative ways for organizing and (69) the results returned by a (70) would be of great utility assisting users to find relevant documents. Document clustering may play a central role as an effective technique for organizing query results.

（69）是（）

A.seeing

B.searching

C.browsing

D.lookingfor