为了提高文化开放水平，应坚持()，扩大对外文化交流，加强国际传播能力和对外话语体系建

— What did Mike do?

— _________________[ ]

A. He did his homework.

B. She did her housework.

C. He goes to school.

________ you are responsible for the information, you must be very careful.

A．Unless

B．While

C．Since

D．Though

患者，男性，48岁，反复反酸、嗳气5年。每次餐后中、上腹胀痛，持续1～2h。近日，上腹部持续胀痛较以往严重。

护士发现忠者呕吐宿食，考虑其出现的并发症可能是

A．低钾血症

B．代谢性酸中毒

C．幽门梗阻

D．癌变

E．穿孔

正装（拆）法竖立桅杆和拆除桅杆作业要点是：控制好桅杆临时分层揽风绳，以防止桅杆晃动或倾倒。

可逆反应