为下列转变提供所需的试剂,必要时注明用量。有的可能需要不止一步反应,请分别写出每步反应所需的试剂。
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在(-∞,+∞)内下列恒等式中不正确的是()。A.aresin(sin x)=xB.sin(arcsin x)=xC.arcsin(sin(cos x))=cos xD.sin(arcsin(cos x))=cos x
Racial or religious d() is happening everywhere in the world.(--the unjust or prejudicial treatment of different categories of people, especially on the grounds of race, age, or sex)
经腹输卵管结扎术后()小时督促受术者自解小便。如无特殊情况,鼓励受术者于术后4-6小时尽早下床活动,可减少肺部与腹部并发症。
The conference attracted more than 380 representatives from d() and international organizations.(- existing or occurring inside a particular country, not foreign or international)