Bai hours does not know month, calls for white jade plate. they suspect Yaotai mirror, flying in the Pik-side. 望庐山瀑布 Health Zi Yan Bai sunshine incense burner, very thick waterfall hanging Maekawa. waterfalls three thousand feet, down suspected Galaxy nine days. gift Wang Lun Li Bai Li Bai Sheng Zhou will want OK, Juventa shore riding song. Taohua Tan thousand feet deep, not as Wang Lun, love for me. Yellow Crane Tower Yellow Crane Tower send Meng Li Bai enemies West speech Yellow Crane Tower, the fireworks in Yangzhou. Gufanyuanying blue sky to make, the only see the sky the Yangtze River flow. Zao Fa Bai Di Bai Bai Di Choi towards speech, the thousands of miles Jiangling day also. Monkeys continuous cries, boat is over 10 thousand hills. South Southern Han Dynasty can lotus, lotus Yehe Tian Tian. fish play lotus East, the fish show lotus West, fish and game South lotus, fish, play lotus North. Geese LUO goose, goose, geese, song items to Tiange, white floating green water, Anthurium dial Qingbo. singing willow He Zhizhang jasper makeup into a tree height, 10,000 green silk sash hanging down. do not know who cut out Egeria? Feb spring like scissors. Teng Guanquelou the Audio sun mountains, The Yellow River flows into the sea. For testimony thereof. encounter problems encounter distance = speed × time encounter encounter encounter time = distance ÷ speed and speed = distance ÷ meet meet time catch the problem distance = speed chase and chase and the time difference × recovery and time = distance ÷ speed of recovery and the speed difference = difference chase and catch and distance ÷ time water problems downstream speed = hydrostatic speed + flow rate speed = hydrostatic speed counter-current - flow rate hydrostatic speed = (speed + upstream downstream speed) ÷ 2 flow rate = (downstream speed - the speed countercurrent) ÷ 2 concentration problem solute weight = weight + solvent solution of the weight of the solute weight ÷ weight of the solution concentration × 100% = weight × concentration of solution = weight of solute ÷ weight of the solute concentration = solution weight profits and discounts profit = selling price - cost margin = Profit ÷ cost × 100% = (sale price ÷ cost -1) × 100% the amount of ups and downs = principal × Change Percentage discount = actual sale price of the original price ÷ × 100% (discount