(Practical) problems limit the (ability) of astronomers to determine the mass of

游客2025-02-09 1

问题 (Practical) problems limit the (ability) of astronomers to determine the mass of asteroids,(who) are small planetary bodied (orbiting) the Sun.

选项 A、Practical
B、ability
C、who
D、orbiting

答案 C

解析

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(Practical)problemslimitthe(ability)ofastronomerstodeterminethemassof