一台发动机失效后，燃油量要按需要平衡，不对称燃油不能超过多少磅？
朝鲜球坚蚧有一种重要天敌，是（）
A. 七星瓢虫
B. 黑缘红瓢虫
C. 草蛉
D. 蚂蚁
Which statement is TRUE of a stiff vessel? （）
A. She will have a large metacentric height
B. Her period of roll will be large due to her large metacentric height
C. She will have an unusually high center of gravity
D. She will pitch heavily
JX-300XP系统流程图文件是存放在（）文件夹下的。
A. flow
B. flowpopup
C. report
D. recompute
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