题目:
用某疗法治疗胃溃疡病人50例,一个月后40例好转,由此可认为()
A.该疗法疗效好
B.该疗法疗效一般
C.该疗法只有近期疗效
D.因治疗例数少,尚不能说明该疗法的疗效如何
E.因无对照,尚不能说明该疗法的疗效如何
答案:
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