心肌由于长期缺血,在心电图上就会出现"损伤性"图型改变,下列何者最为正确()。
A.T波高尖
B.T波倒置
C.ST段明显抬高
D.ST段明显下移
E.病理性Q波
参考答案:C
10/350µs波形的电流幅值是多少?波头时间是怎么算的?(GB50057-1994(2000版)附录六)
Quality is achieved when ().
A.the requirements have been met
B.customer expectations have been exceeded
C.the customer indicates acceptance of the product or service
D.the customer stops asking for additional features