在管制空域进行IFR(仪表飞行规则)飞行,()故障应立即报告ATC。
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In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to the ().
A. crosshead
B. crankpin
C. crank journal
D. gudgeon pi