22．The purpose of their explorations is as important to them as____to us.

A．they are

B．they have

C．it is

D．it has

确定心脏骤停后给予最基本的生命支持方法是

A．触摸大动脉搏动
B．测量血压
C．人工呼吸、胸外按压
D．非同步直流电除颤
E．静脉或气管内滴入肾上腺素