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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】燃油交叉供油的主要目的是（）
A.
允许任一台发动机使用任一油箱内的燃油
B.
当抽油时，可把某一油箱的燃油抽到其它油箱里
C.
当加油时，能确保油箱内燃油达到所希望的油量
D.
以上都错
【单选题】Animal studies are under way, human trial protocols are taking shape and drug makers are on alert. All the international health community needs now is a human vaccine for the bird flu pandemic sweepin...
A.
it has strong side effect to the elderly.
B.
it may turn ineffective in a short period.
C.
it is useless in preventing the virus.
D.
it hasn’t been tested in humans.