I've never _____ him before. [ ]
A. heard of
B. hear from
C. heard to
D. hear of
答案:A
急性腹膜炎病因不明,且无局限趋势时,下列治疗中最关键的措施是
A.禁食、胃肠减压
B.选用广谱抗生素,并根据药敏试验加以调整
C.镇静、止痛、吸氧
D.手术治疗
进行杆塔倒拔校验时,应选择耐张段内()
A.处于高处的杆塔
B.处于低处的杆塔
C.水平档距小的杆塔