2. 外语
  3. Pendulums are used to regulate motion in some scientific equipments.

Pendulums are used to regulate motion in some scientific equipments.

admin2010-01-14  62
问题 Pendulums are used to regulate motion in some scientific equipments.
选项 A、laboratories
B、measurements
C、apparatuses
D、experiments
答案C
解析
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