【简答题】In the 1880s, people drank John Pemberton’s tonic to cure headaches. It wasn’t a very popular drink, and he sold only about a dozen drinks a day. That’s why Pemberton was willing to sell the rights to...
【简答题】A Beijing company signed a contract to import wool from Australia. The quantity was specified as“20M/T”.When the wool was delivered,it had a regain of 33%. (1) What is a regain rate ? (2) Why did the ...