荧光灯电路中一般采用在电源两端并联适当的电容器来提高功率因数。 ( )
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荧光灯点亮后,镇流器起降压限流作用。( )
A. 对
B. 错
RL串联电路中,电阻、电感和阻抗构成阻抗三角形。( )
A. 对
B. 错
RL串联电路中,无功功率就是做的无用功。( )
A. 对
B. 错
1.Good teachers should encourage students to use their ________ to express themselves and make them feel proud of what they can achieve.
A. create
B. creativity
C. creative
D. creation