一辆氢气动力试验汽车所受的重力为1.5×104N,10min内汽车在平直路面上匀速行驶了1.2×104m,消耗了0.15kg的氢气,此过翟汽车发动机产生的牵引力为1.0×103N,行驶时汽车轮胎与地面接触的总面积为0.1m2.(氢气的热值取1.4×l08J/kg,g取10N/kg)求:
已知在函数y=kx+b,其中常数k>0、b<0,那么这个函数的图象不经过的象限是( )
某音响电路的简化电路图如图所示,输入信号既有高频成分,也有低频成分,则( )
Mike____ (与……相似) his mother in appearance while his personality follows his father's.