以下为急性心肌炎可能出现的心电图改变,但应除外()
A.各种类型心律失常
B.传导阻滞
C.QRS波群低电压和异常Q波
D.ST抬高或下移
E.QT间期缩短
参考答案:E
By the year 2015, all of China's museums will be free to enter. We _____ visit any museum without paying. [ ]
A. can
B. need
C. must
D. should
直流锅炉汽压调整是调整锅炉的给水量,必然导致汽温变化,说明两者调整是相互关联的。