Because system test executed regression, stress, and duration runs during the iterations, defects were identified and removed very close to the time of injection.
因为在迭代过程中，系统测试执行回归、压力，和持续时间执行，所以在缺陷注入不久就被确定并除去了。
Chongqing Medical University, Chongqing Objective To investigate effects of contrast medium injection on QRS duration and frontal plane QRS axis during coronary angiography.
目的探讨冠心病患者冠状动脉造影剂注射对心电图QRS时间及QRS额面电轴的影响。
Methods QRS duration and frontal plane QRS axis were measured before and after injection of contrast medium in 34 patients with left coronary artery disease identified by coronary angiography.
方法观察34例经冠状动脉造影确诊为左冠状动脉狭窄而右冠状动脉无病变的冠心病患者，注射造影剂前后QRS时间和额面电轴的变化。
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