Whitney Houston was 小题1: b        on August 9, 1963. She is an famous American singer, actress and model. She is the most awarded woman artist of all time, according to Guinness(吉尼斯) World Records and she had won 415 awards by the year 2010.

Houston’s success in the music industry made her well-known, after that she 小题2:e         the film world. In 1992, she acted in “The Bodyguard” with Kevin Costner. Though some people in the world were not satisfied 小题3: w        Houston’s acting, the film was a great success, making more than $410 million worldwide. It also made “I Will Always Love You” one of her most popular songs.

Houston passed 小题4:a       on February 11, 2012. People all over the world mourned the 小题5:l         of her by collecting her albums and videos. Later last year her film “Sparkle”was shown in cinemas.

全桥式和推挽式功率转换电路中相同集电极电流时的输出功率（）。

A、与半桥式功率转换电路的输出功率相同

B、是半桥式功率转换电路的输出功率的2倍

C、是半桥式功率转换电路的输出功率的1/2倍

D、是半桥式功率转换电路的输出功率的1/3倍