同时设置了enable secret和enable password两种特权密码，（）密码有效
A. enable secret
B. enable password
C. 两种
D. 没有
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What is the role of the condenser lens（）
A. Control the aperture of light
B. Increase the magnification
C. Focus the light on the specimen
D. Provide light
Which microscope would be particularly useful for looking at living cells（）
A. Confocal microscope
B. Compound microscope
C. Phase contrast microscope
D. Scanning electron microscope
康复小组包括（）
A. Physiotherapist
B. Occupational therapist
C. Speech therapist
D. Psychologist
Apart from technological development, the 20th century ____ an enormous worldwide political, economic and cultural transformation（）
A. witnessed
B. witness
C. witnessing
D. has witnessed
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