After investigating the behavior of( ),Galileo was able to use them as time measurement devices in many of his experiments. ( 章节：4 难度：2)_做题室

单项选择题After investigating the behavior of( ),Galileo was able to use them as time measurement devices in many of his experiments. ( 章节：4 难度：2): A、pendulums; B、establishments; C、pendulum; D、establishment

正确答案：A
答案解析：
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