Which statement is TRUE concerning lifeboat gripes?（）

A.They must be released by freeing a safety shackle

B.They should not be released until the boat is in lowering position

C.They may be adjusted by a turnbuckle

D.They are normally used only with radial davits

2008年，我国实际利用外商直接投资783．39亿美元，对外直接投资500亿美元。这表明，我国在对外开放中（）

A.积极参与区域经济交流与合作

B.形成了全方位、宽领域、多层次的对外开放格局

C.坚持“引进来”和“走出去”相结合

D.积极利用外资发展