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1·A duplicate sample shall be sealed after inspection.

检验后须封存一份复样。

2·You may assume that the value for a is nonzero. Your program should be able to duplicate the following sample run.

你可以假设该值是一个非零值。

3·When a country has lots of money, lots of very talented engineers and access to just one sample of another country's technology, then it does not take very long to duplicate it.

当一个国家有很多钱、很多很有才华的工程师、能访问另一个国家的技术样本，那么复制它就不会花很长的时间。