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Ⅱ级B1型生物安全柜：

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Ⅱ级B2型生物安全柜：

Ⅱ级A2型生物安全柜：

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.