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问题 单项选择题

在工程网络图中，M工作的最早开始时间为第14天，持续时间为6天，该工作有三项紧后工作，它们最早开始时间分别为第23天、21天、22天，则M工作的自由时差为 ( )。

A．4天

B．3天

C．2天

D．1天

答案

参考答案：D

单项选择题

（）是指标志的构图紧凑、图形简练，这也是标志艺术必须遵循的结构美原则。

A.特征美

B.凝练美

C.秩序美

D.复杂美
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单项选择题

Traditional Internet access methods like dial-up were so slow that host computers were connected to the dial-up. (6) at the customer premise over slow (7) ports. PPP was designed to run directly over these serial links. But with the advent of broadband Internet (8) technologies such as ADSL and cable modems there has been a considerable increase in the bandwidth delivered to the end users. This means that the host computers at the customer premise connect to the (9) or cable "modem" over a much faster medium such as Ethernet. It also means that multiple (10) can connect to the Internet through the same connection.

（6）是（）

A.buffer

B.modem

C.computer

D.server
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