请说明三相半波和三相全波桥式整流电路负载电压Ufz和变压器二次电压U2间的关系?
参考答案:
三相半波整流电路Ufz=1.17U2三相全波整流电路Ufz=2.34U2
Several of the passengers were hurt and one was taken to hospital. Luckily _____ was killed. [ ]
A. no one
B. not all
C. none
D. no other
男性,34岁。1周前左足底被铁钉刺伤,自行包扎,昨夜突感胸闷、紧缩感,晨起张口困难和抽搐,诊断为破伤风。
用镇静剂来控制和解除痉挛、抽搐,其目的是()
A.保持安静
B.防止窒息和肺部感染的发生,减少死亡
C.保证进食
D.减少氧的消耗
E.防止坠床