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采用滴液漏斗加样，主要是为了（ ）
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反应初馏出液中的乙醇，用下列哪种试剂洗涤除去 （ ）
反应废液铬盐，对其表述哪种是不正确的 （ ）
In recent years, global warming is becoming a concern for people all over the world. It generally causes by the 1._____________ in the amout of carbon dioxide(二氧化碳）and other greenhouse gases(温室气体）in the atmosphere. In fact, it's the human activities that lead to these gases. The 2._________of fossil fuels such as, 3.______________and oil is one of the best-known causes for global warming. The bad effects of global warming are alarming. Even a rise of three degrees could 4.______________in raising sea levels. What's worse, storms and floods will become more 5._____________. Now it's high time that we took some measures to protect our planet.
单相桥式整流电路中，若其中一只二极管反接，会出现什么现象？
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