题目内容
在Python中，所有双分支的if语句都可以转换为两条单分支的if语句。
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________, invented by Zhang Heng, can indicate the direction of a distant earthquake. It was over 1,700 years later that a similar instrument was invented in Europe.
________ was first developed in ancient China, with some of the earliest found in as early as 3,500 BC.
Fireworks were probably first made by stuffing ________ into bamboo sticks.
The abacus is an early form of a calculator.
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