题目内容

有效单体是指存在于生物体内的具有生理活性或疗效的化合物。()

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有效成分是指天然药物中具有一定的生物学活性，能代表其功效的化学成分。()

Which of the following is true when navigation with radar during restricted visibility ().① Radar may not indicate small vessels and icebergs;② Radar may mean that safe speed is even slower due to the indication of other vessels on the scope.

A. ① only
B. ② only
C. Both ① and ②
D. Neither ① nor ②

GCP的总体要求是各环节的研究工作必须符合伦理学(即公正、尊重人格、力求使受试者最大程度受益和尽可能避免伤害)的要求。()

根据13C-NMR(全氢去偶谱)上出现的谱线数目可以确定分子中不等同碳原子数目。()