A3/A4 题型 为明确诊断,宜为患者进行的检查是大题题干:患者,男性,27岁,上腹痛2天,能忍受。今日午餐后疼痛加剧,伴有呕吐,吐后疼痛不缓解,疑为急性胰腺炎
A、血清淀粉酶测定
B、血白细胞计数
C、血清脂肪酶测定
D、血钙测定
E、血糖测定

单项选择题设A为n阶方程，Ax=0只有零解，则只有玲姐的方程组个数是（ ）

单项选择题“The population-attributable fraction associated with totalanticholinergic drug exposure during the 1 to 11 years before diagnosis is 10.3%..” This sentence is inaccurate as ( ).