我们把能使不等式___________ 的值，叫做不等式的解
成立的未知数
颈椎病经颈后路手术的病人，护士术前应指导其（）
A.进行俯卧训练
B.做颈部前屈运动
C.做颈部后伸运动
D.推移气管和食管训练
E.做颈部侧转活动
The earliest packet-switched network that connected a few universities and research centers was known as ARPANET. ( )
