Crankcase explosions in propulsion diesel engines result from
A. the splashing of lubrication oil by the crankshaft
B. the dilution of crankcase oil with particles of combustion
C. broken fuel lines spraying oil on the crankcase
D. the ignition of unburned fuel and air in the crankcase
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After installing a new hydraulic pump in a system, what special attention should be given
A. The relief valves in the system should be readjusted
B. The filters and strainers should be checked frequently
C. All system pressure should be readjusted
D. The system should be drained and renewed with a fluid of different operating characteristics
如果石油的价格上升，________。
AD曲线向右移动，实际GDP增加，价格水平上升
B. AS曲线向左移动，价格水平上升，实际GDP下降
C. AD曲线和AS曲线向左移动，实际GDP下降，价格水平上升
D. AD曲线和AS曲线向右移动，价格水平上升，实际GDP下降
E. AS曲线向左移动，价格水平上升，实际GDP上升
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