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【单选题】
E-Mail Message To: All marketing staff From: Kelly Brooks Re: Postponement of Marketing Meeting I am writing to let you know that we are postponing the marketing meeting tomorrow until further notice. Our marketing manager, Wilber West, called in sick this morning and will return to work next week. I will announce the date of the marketing meeting as soon as Mr. West is back from his sick leave. Thank you. Kelly What is the purpose of the e-mail?A.
To file a sick leave.
B.
To postpone a meeting.
C.
To confirm attendance.
D.
To propose a marketing strategy.
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举一反三
【单选题】合金工具钢是在碳素工具钢中加入适量的合金元素，用于制造（）。
A.
各种结构复杂的刀具
B.
低速手用的刀具
C.
不锈钢和高强度钢切削用的刀具
D.
高速切削一般钢材的刀具
【简答题】在一个16位的总线系统中，若时钟频率为100MHz，总线数据周期为5个时钟周期传输1个字。试计算总线的数据传输率。
【单选题】WHAT IS A CHARACTERISTIC OF UDP?
A.
UDP only passes data to the network when the destination is ready to receive the data.
B.
UDP datagrams take the same path and arrive in the correct order at the destination.
C.
Applications that use UDP are always considered unreliable.
D.
UDP reassembles the received datagrams in the order they were received.
【单选题】在一个16位的总线系统中，若时钟频率为100MHZ，总线周期为5个时钟周期传输一个字，则总线带宽是（ ）。
A.
4MB／s
B.
40MB／s
C.
16MB／s
D.
64MB／s
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