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Do not let any failures discourage you, for you can never tell______close you may be to victory.
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Halloween falls on October 31st. It is one of the most favourite holidays for children in the USA.
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将铁粉加入到一定量的硝酸银、硝酸铜及硝酸锌的混合溶液中.待充分反应后过滤,再在滤渣中加入稀盐酸,没有气体产生,则在滤液中( )
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