1. 已知L1=3mH，L2=6mH，串联后的等效电感为______ mH。
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Language is a means of [填空1] communication.
Language is [填空1] in that speaking or writing is a purposeful act.
Language is [填空1]. We use language to exchange ideas with others in social interaction.
Language is acquired by all people in much the[填空1]way.
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