如何理解习近平总书记提出的“四个全面”战略布局？

A. They are heavier than air and will settle in the lowest part of the vessel
B. They are lighter than air and will settle in the highest part of the vessel
C. They should be vented into the engine to improve combustion
D. They should be vented into the wheelhouse

A. 0.35
B. 0.6
C. 0.7
D. 1

A. 7.60
B. 7.70
C. 8.42