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Ⅱ级A2型生物安全柜：
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生物安全柜（biosafety cabinet；biological safety cabinet）：
In characterization, the_______ method of telling relies on exposition and direct commentary by the author, while the other, _________ dramatic method, involves making the characters reveal themselves directly through their dialogues and actions.
串联型稳压电路通过引入电压负反馈来稳定输出电压。
要获得+9V的稳定 ，集成三端稳压器应选择（ ）
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