提高功率因数的方法有（）和（）。
参考答案：提高用电设备本身的功率因数；在感抗负载上并联电容器提高功率因数
Teachers in a/an ______ classroom are encouraged to show approval for each and every correct performance by their students，and the drills are designed to produce success for the students.
A．Grammar-Translation
B．Situational
C．Audiolingual
D．Communicative
关于多发性抽搐症的描述以下哪项不正确( )
A．多发性运动肌快速抽搐
B．男弦发病率高于女孩
C．伴有不自主发声
D．可有语言障碍
E．四肢抽搐
