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举一反三
【单选题】生物指示剂的培养过程中，使用阳性对照的意义在于（）
A.
提示正确的培养条件，避免因为不合格的培养条件，造成假阳性
B.
提示芽孢的正常发育能力，避免因为芽孢在自身在灭菌前死亡，造成假阳性
C.
阅读器功能完好
D.
以上所有正确
【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