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题目内容双击单词支持查询和收藏哦～
Once the disk of material around a star is gas-depleted, dust is removed efficiently by the stellar radiation field and wind; any observed dust in a gas-depleted disk must, therefore, have been produced ______.
- A.gradually
- B.rapidly
- C. recently
- D. vestigially
- E.intermittently
C显示答案
· 相关考点
取同-因果逻辑
取同-因果逻辑
以上解析由 考满分老师提供。
