feed times
LV1 5 x 4
LV2 10 x 4
LV3 20 x 4
LV4 40 x 4
LV5 80 x 4
LV6 160 x 4
LV7 320 x 4
LV8 640 x 4
LV9 1280 x 4
LV10 2560 x 4
LV11 5120 x 4
LV12 10240 x 4
LV13 20480 x 4
LV14 40960 x 4
LV15 81920 x 4
LV16 163840 x 4
LV17 327680 x 4
LV18 655360 x 4
LV19 1310720 X 4 升至LV20