多式联运单证是多式联运经营人接管货物的初步证据，多式联运经营人不得以相反的证据对抗善意的单据持有人。 ( )
参考答案：对
---The Bird's Nest, isn't it?
---Yes. It's ___________we visited during our stay in Beijing.
A．where
B．what
C．when
D．That
沼气发电系统主要包括：沼气发动机、（）、废热回收装置、气源处理。
---Yes. It's ___________we visited during our stay in Beijing.