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【单选题】
下列关于可持续发展的认识,正确的是 ( )A.
停止开采非可再生资源,为子孙积累巨大财富
B.
加大各类可再生资源的开采力度
C.
控制人口增长,使人口数量维持在目前的水平
D.
在资源开发利用时,不能危害未来人类的生活需求
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皮皮学刷刷变学霸
举一反三
【单选题】求美者，女性，21岁，因“下巴后缩”要求整形。为了评估该求美者的颏部发育是否正常，叙述错误的是（）
A.
颏点应该位于面部正中线上
B.
使用Rickett审美平面，观察鼻尖、唇、颏部三点是否位于此平面上
C.
正面观，颏部长度的美学比例是上唇高∶下唇颏高=1∶1
D.
鼻底至口裂线∶口裂线至唇颏沟∶唇颏沟至颏下=1∶1∶1
E.
下唇和颏部连线上，最凹陷的部位是唇颏沟
【判断题】Mycoplasmas are organisms without cell walls, and can easily revert to walled organisms.
A.
正确
B.
错误
【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.
【单选题】A principal criterion for the diagnosis of meningitis due to Neisseria meningitidis is ( ).
A.
Observation of acid-fast rods in the spinal fluid.
B.
Gram-negative cocci, arranged in pairs, in the spinal fluid.
C.
Gram-negative rods in the spinal fluid.
D.
Observations of mycoplasmas in the spinal fluid.
E.
Gram-positive rods in the spinal fluid.
【简答题】Which of the following does not belong to Prokaryotic
microorganisms ?A. bacteria B. mycoplasmas C. chlamydiae D. prion
【单选题】Antibiotics are mostly produced by
A.
Chlamydia
B.
Bacteria
C.
Mycoplasmas
D.
Actinomycetes
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