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【多选题】
关于计算机系统层次结构的描述中，正确的是A.
不同层次面向不同用户，看到计算机的属性不同
B.
低层代码执行效率比高层代码执行效率高
C.
低层用户对硬件的透明性比高层用户要低
D.
指令集架构层是软、硬件间的接口
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【简答题】A Welcoming Speech 欢迎致辞 Write a welcoming speech of about 100 words based on the following situation: Doctor Brown, who is well known to the world for his achievements in the field of medicine, comes ...
【简答题】I’m very ______ about the speech contest.
【单选题】Which of the following statements about speech conclusions is true?
A.
The conclusion should take up about 25 percent of a speech.
B.
All four methods of reinforcing the central idea can be combined in a single conclusion.
C.
Ending a speech abruptly is an excellent way to reinforce the speaker’s central idea
D.
The last sentence of a speech should usually offer to answer questions from the audience.
【单选题】在C54X系列的DSP汇编语言程序中，定义一个小数如0.907，应当写成（）。
A.
0.907
B.
32768*0.907
C.
907/1000
D.
32768*907/1000
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