题目内容
RL串联电路中,电阻、电感和阻抗构成阻抗三角形。( )
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RL串联电路中,无功功率就是做的无用功。( )
1.Good teachers should encourage students to use their ________ to express themselves and make them feel proud of what they can achieve.
Life is full of _________. We should be strong enough to face up to them.
Setting a goal and going ________ to achieve it can be a great test of one's will and perseverance.
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