下腹部手术后,当日患者出现尿潴留,应采取措施是()。
A.膀胱穿刺抽尿液
B.膀胱造瘘
C.导尿
D.用利尿剂
E.用手按摩挤压膀胱区
参考答案:C
By the time he was ten,Edison______experiments in chemistry.
A.had already done
B.already had done
C.was already doing
D.already did
下面关于精馏塔精甲醇采出说法正确的是()。
A、在保证足够的回流量下,适当采出
B、在保证足够的采出量下,适当回流
C、回流和采出没有主次
D、回流和采出没有关系