In Europe, AC is usually generated at 50 Hz.欧洲的交流电输出频率通常为50赫兹。A measure of sound intensity equivalent to one decibel at 1000 Hz.一种声强的量度单位,其值等价于1000Hz1分贝.The frame rate is then 60 Hz.这时,帧速率为60赫....
长度: 8 - 0页,12级字型, 双倍行距, 用钉书机装钉并标示页码.Length: 8 - 10 typed pages , double - spaced in 12 - point type, stapled, with pages numbered.这种机器可以将纸牌装钉在袜子上.This kind of machine can staple paper brand - label on the socks.古铜色铝合金边框,...