The 18 college students in Fudan University should           show their greatest respect to their hero — Zhang Ninghai instead of being cold and unfeeling.

A．absolutely

B．slightly

C．fluently

D．painfully

水平匀速运动的车厢内装满西瓜，其中质量为m。西瓜A受到周围其他的压力大小为___________，当车厢以加速度a向右运动时，A所受到的压力大小为___________，方向___________。