【单选题】当门的宽度大于( )mm 时,需增设一根中竖框。
【单选题】Critical speeds occurring within the operating speed range of a main propulsion diesel engine may be changed,or have their damaging effects reduced by a(an) ________.注:detuner 解调器:viscous fluid damper...
A.
engine support vibration fluid damper
B.
detuner or viscous fluid damper
C.
lightened crankshaft flywheel
D.
spherically seated crankshaft bearing
【判断题】甘肃花丿L是一种全新的地方性的少数民族剧种。
【单选题】群体内聚力与生产效率的关系依赖于群体中所建立的()
【单选题】群体内聚力与生产效率的关系依赖于群体中所建立的____