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什么叫加热器的过热段？ 皮带出力 如何使声音无限循环播放（） ["A、将声音的循环次数设为无穷大；","B、将声音的循环次数定义成足够大便可；","C、不能实现；","D、通过程序可以实现"] 下列哪种播放器版本能观看用屏幕创建的SWF文件（） ["A、Flash Player 4；","B、Flash Player 5；","C、Flash Player 6；","D、Flash Player 7"] 心轴 转轴