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【多选题】
德国研究人员进行的一项多中心、随机、双盲为期8周的平行组对照试验比较了倍他乐克缓释片100mg/天或比索洛尔10mg/天的降压效果，结果显示：
A.
倍他乐克缓释片组治疗4周的降压效果无论收缩压还是舒张压均明显优于比索洛尔组（P＜0.01）
B.
倍他乐克缓释片组治疗8周时的降压效果无论收缩压还是舒张压均明显优于比索洛尔组（P＜0.01）
C.
静息心率下降幅度相似
D.
倍他乐克组的死亡率稍高于比索洛尔组
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【单选题】However, there was potential bias in the included studies, so the conclusion still needed further high quality（ ）(随机对照试验）to improve the evidence level.
A.
randomized treated trials
B.
randomized controlled trials
C.
randomized controlled examination
D.
randomly controlled trials
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【单选题】However, there was potential bias in the included studies, so the conclusion still needed further high quality（ ）(随机对照试验）to improve the evidence level.
A.
randomized treated trials
B.
randomized controlled trials
C.
randomized controlled examination
D.
randomly controlled trials
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