【名词&注释】
增压柴油机(turbocharged diesel engine)、四冲程(four-stroke)
[单选题]由四冲程增压柴油机的换气过程特性可知，在进气阀打开瞬时，气缸内压力( )。
A. 低于进气压力
B. 高于进气压力
C. 等于进气压力
D. 忽高忽低
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举一反三：
[单选题]Which statement is NOT true?
A. In a simple vane pump, the rotor and cam ring are exactly concentric
B. Balanced vane pump has an elliptical cam ring
C. Liquid in both gear pump and vane pump are forced out to the outlet.
D. Balanced vane pumps can work at a higher pressure than the simple vane pump
[单选题]闪燃是指发生短暂的闪火现象，通常其闪火时间少于______。
A. 15秒
B. 10秒
C. 5秒
D. 8秒
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