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【多选题】
计算机系统存在漏洞的原因有________。A.
编程人员故意制造病毒
B.
编程人员在程序代码的隐藏处保留后门
C.
受编程人员的能力、经验和当时安全技术限制
D.
编程人员无法弥补硬件的漏洞
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举一反三
【单选题】Mycoplasmas, rickettsiae, and chlamydiae are
A.
types of fungi
B.
small bacteria
C.
species of protozoa
D.
forms of viruses
【单选题】The wall-less mycoplasmas are considered to be related to gram positive bacteria. Which of the following would provide the most compelling evidence for this?
A.
They share common rRNA sequences.
B.
Some gram-positive bacteria and some mycoplasmas produce catalase.
C.
Both groups are prokaryotic.
D.
Some gram-positive bacteria and some mycoplasmas have coccus-shaped cells.
E.
Both groups contain human pathogens.
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