In November 2018, scientists from 60 countries voted unanimously to redefine the kilogram and three other standard units of measure: the ampere, for electrical current;the kelvin, for temperature;and the mole, which d...In November 2018, scientists from 60 countries voted unanimously to redefine the kilogram and three other standard units of measure: the ampere, for electrical current;the kelvin, for temperature;and the mole, which describes the amount of a chemical substance [1].展开更多
I have a dog named Echo.He is two years old now.He is the son of my cousin's dog.I like him very much.He has white fur and big black eyes.He is quite small and weighs only about two kilograms.He has a keen sense o...I have a dog named Echo.He is two years old now.He is the son of my cousin's dog.I like him very much.He has white fur and big black eyes.He is quite small and weighs only about two kilograms.He has a keen sense of smell.Because of this,he can find his favourite food every time.展开更多
文摘In November 2018, scientists from 60 countries voted unanimously to redefine the kilogram and three other standard units of measure: the ampere, for electrical current;the kelvin, for temperature;and the mole, which describes the amount of a chemical substance [1].
文摘I have a dog named Echo.He is two years old now.He is the son of my cousin's dog.I like him very much.He has white fur and big black eyes.He is quite small and weighs only about two kilograms.He has a keen sense of smell.Because of this,he can find his favourite food every time.
