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
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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
What does computer program mean（）
A. Command sequence to achieve a given task
B. Collection of all commands of a computer
Commands that the computer can recognize and execute
D. High-level programming language statements
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