以下何种保护关车只在95%转速以下会发生（）A、APU无加速 B、低滑油压力 C、高滑油

D
Cost of American Wars
Notes: ① GDP → 国民生产总值
② 1 billion =" 1,000,000,000             "      ③1 trillion = 1,000,000,000,000
69. Which wars cost more than a year’s worth of the GDP?
A. First Gulf War and World War I                           B. The Civil War and World War II
C. World War II and Revolutionary War                    D. Mexican War and Civil War    
70. The American annual gross domestic product in 1951 was _________.
A. 2.239 trillion            B.2.9 trillion          C. 3, 25 trillion      D. 76.1 billion 
71. Which of the following is NOT true?
A. Mexican War cost more than War of 1812.
B. First Gulf War cost the least in term of the percentage of the annual of GDP.
C. World War II cost more than Korean War.
D. Mexican War cost as much money as Spanish American War.