A:126km/h
B:70km/h
C:52.5km/h
D:30km/h
如图是测量汽车质量的地磅示意图,汽车的质量可通过电流表的示数读出,下列说法正确的是( )
Your computer doesn't work. You'd better have it .
已知a>0,b>0,a+b=1,则1a+1b的取值范围是( )