A:△H=+244.1kJ/mol
B:△H=-488.3kJ/mol
C:△H=-996.6kJ/mol
D:△H=+996.6kJ/mol
— ________ does it take Bob to get to his grandparents' home?
— An hour.
下列关于原核生物和真核生物的叙述,正确的是( )