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下方程序的运行结果是：______a=3b=4c=1if a>=b:if a>=c:print(a)else:print(c)else:if b>=c:print(b)else:print(c)

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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。

A. 对
B. 错

________, 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.