标准状况下,将充满O2和NO2混合气体的试管倒置于水中,液体完全充满试管。此时试管内溶液中溶质的物质的量浓度是
The CDs are on sale! Buy one and you get ______ completely free.
I’m sure that your letter will get______ attention. They know you’re waiting for the reply.
All the dishes in this menu, ______ otherwise stated, will serve two to three people.
The children loved their day trip, and they enjoyed the horse ride ______.
I can’t leave. She told me that I ______ stay here until she comes back.