If somebody has ________ first-degree burn, give him or her ________ first aid by placing a cool, and wet cloth on it.

A．the;不填

B．the; the

C．a; the

D．a;不填

压力表在升压检定和降压检定时，各对应检定点上，轻敲表壳后，（）读数之差叫压力表的（）。