资讯

BBC1 年
The mole and concentration of solutions The mole - BBC
The gram formula mass of a substance is known as the mass of one mole. The mass, number of moles, concentration or volume of a substance can be calculated easily if you learn two formula triangles.
NPR1 年
A sniffer dog helps rediscover a rare mole : NPR
The De Winton's golden mole was last spotted in 1936. But with the help of a mole-sniffing dog and new environmental DNA analysis, researchers are taking it off the most wanted lost species list.