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【单选题】
用极值法计算尺寸链，尺寸链封闭环的公差等于各组成环公差（）。A.
最大值
B.
最小值
C.
平均值
D.
之和
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【单选题】According to the passage, film industry executives have been reluctant to support African-American cinema for which of the following reasons?
A.
Executives believe that African-American audiences are often repelled by the presentation of ideological issues in film.
B.
Executives conclude that African-American cinema is not likely to attract audiences overseas.
C.
Executives are of the opinion that African-American actors who emerge as stars are reluctant for the executives to associate them with 'black' films.
D.
Executives are under the impression that there are many strong African- American producers, but few willing to work with mainstream studios.
E.
Executives are reluctant to support films which contain too many negative stereotypes about African-Americans.
【简答题】听力原文：What are the responsibilities of the senior executives in a company? What are the responsibilities of the senior executives in a company? They establish the ______ for their companies.
【单选题】下列有关TCP和UDP的说法错误的是( )。
A.
数据从应用程序中以字节流的形式传给TCP,而在UDP中,应用程序发送的是数据块
B.
在TCP传输控制中,序号和确认号用来确保传输的可靠性。
C.
UDP并不提供对IP协议的可靠机制、流控制以及错误恢复功能等
D.
网络文件系统(NFS)、简单网络管理协议(SNMP)、域名系统(DNS)以及简单父件传输系统(TFTP)的传输层都是用TCP实现的。
【单选题】自然保护区分为 _________ 。
A.
国家级自然保护区和地方级自然保护区
B.
国家重点自然保护区、省级自然保护区
C.
国家重点自然保护区、省级自然保护区和市、县级自然保护区
D.
国家级自然保护区、省级自然保护区和地方自然保护区
【简答题】The names of new executives and board members.
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