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青霉烷
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青霉烷
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青霉烷
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penam
青霉烷
一种杂环体系,青霉烷类抗生素的主核。
Chemistry
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penam
青霉烷
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timber members
timber price
timber production forest
timber production machinery
timber revenue
timber structure system
timber transportation
timbre
Tim Brown
Timbuktu
Timbuktu Kou'an
Tim Burton
Time
time
time accuracy
time and frequency dissemination
time and frequency measurement instruments
time and frequency measurements
time and frequency metrology
time and frequency primary standard
time and frequency service
time and frequency signal
time and frequency synchronization
time and frequency transfer
time and frequency transfer via optical fiber
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