低压配电网工作票和紧急抢修工作票如需变更工作负责人,应()。
A. 得到调度许可
B. 征得值班负责人同意
C. 重新办理工作票
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在管制空域进行IFR(仪表飞行规则)飞行,()故障应立即报告ATC。
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