211. Our daily Beijing Mean Time is in fact Nanjing Time. That’s because we set our time by the standards of Tzichingshan (Zijinshan) ______ in Nanjing.
| A．obligation | B．observatory | C．oraganization | D．Laboratory |
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211. Our daily Beijing Mean Time is in fact Nanjing Time. That’s because we set our time by the standards of Tzichingshan (Zijinshan) ______ in Nanjing.
| A．obligation | B．observatory | C．oraganization | D．Laboratory |
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