已知WK-10A型挖掘机,行走电机转速为740转/分,行走总传动比为306,求主动轮转速为多少?
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In some type of two-stroke engines, besides some small holes for(), starting valve, safety valve, indicator cock, and central opening in each cylinder cover for mounting the()
A. fuel valves;exhaust valve
B. exhaust valves;inlet valve
C. fuel valves;inlet valve
D. exhaust valves;fuel valve
确定批量和生产间隔的以量定期法一般有两种方法,()和()。
陆军按其担负任务的不同,分为野战军和地方军,地方军就是协作公安维护社会治安的部队。
A. 正确
B. 错误
钢轨探伤采用入射角为50°,折射角为67°的横波在轨头内作二次反射的探测的原理是什么?