如果要输入大量文字，使用PowerPoint的视图是最方便的________视图。A

The pilot asked all the passengers on board to remain _________ as the plane was making a landing.

A．seat

B．seating

C．seated

D．to be seating

包辊和粘辊是一回事。

腹膜后血肿、胆汁染色和捻发音，是十二指肠损伤的典型表现。（）

X线诊断冠心病最准确方法（）

A.透视

B.平片

C.记波摄影

D.心血管造影

E.缩影摄影