A less expensive but less effective alternative is a notice put through the letter-slot.
另外一个可以选择的比较廉价和较低效率的方式，是一个通过门缝塞入的信件来通知。
Through the operation of confusion and slot number mapping, a frequency hopping sequence can be produced with fine uniformity and less-than-512 arbitrary slot number.
该方法通过混淆运算、频隙映射的方式产生出均匀性好、可用频隙数小于512的任意频隙跳频序列。
When the slot inlet Angle decreases from the optimal point, the accelerating effect of slot is reduced due to less differential static pressure, thus the effect of jet would also be reduced.
当槽道进气角较小时，由于槽道进出口两端静压差减小，槽道对气流的加速作用下降，射流的作用效果也将降低。
When the slot inlet Angle decreases from the optimal point, the accelerating effect of slot is reduced due to less differential static pressure, thus the effect of jet would also be reduced.
当槽道进气角较小时，由于槽道进出口两端静压差减小，槽道对气流的加速作用下降，射流的作用效果也将降低。
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