A. 20mm B. 30mm C. 40mm D. 50mm
A. 工艺技术的先进性 B. 工艺技术的经济合理性 C. 工艺技术实施的便利性 D. 技术来源的可靠性
A. The sequence of events that produce a power pulse B. One rotation of the engine crankshaft C. One stroke of a piston D. All of the above
A. 正确 B. 错误