2014年3月2日，俄罗斯以保护黑海舰队和生活在克里米亚的俄罗斯公民安全为名出兵克里米亚。以美国为首的西方国家随即宣布对俄实施制裁。该情况与下列哪一历史状况相似（）？

A.冷战

B.全球一体化

C.世界多极化

D.经济全球化

A crew member reports that the high-pressure alarm light of a low-pressure CO₂ fixed fire extinguishing system is illuminated. The most probable cause of this condition would be that（）.

A.an air leak has developed in the tank

B.the tank cooling system has malfunctioned

C.the pilot cylinder discharge valve is leaking

D.an excessive amount of insulation has been installed on the tank and piping