A:13
B:23
C:59
D:49
孝感城区每天清晨都要进行洒水,若一辆洒水车空车质量6t,水罐容积5m3.装满水后,车轮与地面的总接触面积为0.5m2.(g取10N/kg,ρ水=1.0×103kg/m3).
问:
下列与酶相关实验的叙述中,正确的是( )
----The radio says that a new typhoon (台风) is coming.
---- Really, All the ____ (渔民)on the sea must come back.