耦合线圈的自感 L1 和 L2 分别为 4 H 和 9 H ,当耦合线圈全耦合时,则互 感 M 为 ( ) 。
A.
8H
B.
4H
C.
16H
D.
6H
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参考答案:
举一反三
【判断题】For your safety, please remain seated with your seatbelt fastened, leaving all items of hand luggage safely stowed, until the seatbelt sign have been switched off.