Which of the following is not a feature of ‘shell’（）
A. It’s a low-level interface to the operating system
B. You can type shell commands from the console
C. You can write shell scripts
D. Linux supports multiple ‘shell’
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Which of the following is wrong about the description of embedded system（）
A. It can solve certain problems
B. It is no different from general-purpose computers in the nature of technology
C. It has more powerful functions than general-purpose computers
D. It has strict requirements on volume, power consumption, reliability and cost
Which is the advantage of using embedded operating system（）
A. The system runs faster
B. The system has higher execution efficiency
C. Application softwares run faster
D. Programmers can focus on problems
Usually, trade fairs can only be attended by _____ and members of the press（）
A. company representatives
B. the public
C. customers
D. everyone
Which of the following statement does not describe changes and trends of the company performance（）
A sharp increase of the prices of raw materials led to considerable drop in sales
B. The year of 2018 witnessed a 15% decline in our company output
C. In 2017, the net profit of the company is RMB 108 million
D. We have been experiencing moderate growth in the past few years
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