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荧光灯点亮后,镇流器起降压限流作用。( )

A. 对
B. 错

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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

Life is full of _________. We should be strong enough to face up to them.

A. challenge
B. challenging
C. challenged
D. challenges