【单选题】Rotating shafts particularly those that run at high speeds, must be designed to avoid operation at speeds.
【单选题】The possibility of damage from operating a diesel engine at critical speeds is reduced by the use of_____.
A.
an isochronous governor
D.
a cast iron bed plate with good flexible qualities
【单选题】Engine speeds at which resonance can occur are termed ______.
【单选题】表现型正常,但带有致病基因的杂合体称为( )
【单选题】Engine speeds at which resonance can occur are termed ____.
【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 __________.
A.
engine support vibration isolator
B.
detuner or viscous fluid damper
C.
lightened crankshaft flywheel
D.
spherically seated crankshaft bearing
【单选题】Engine speeds at which resonance can occur are termed _____.注:resonance 共振
【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 _____.
A.
spherically seated crankshaft bearing
B.
engine support vibration isolator
C.
detuner or viscous fluid damper
D.
lightened crankshaft flywheel
【多选题】关于千分尺下列说法正确的有:( )
A.
千分尺又叫螺旋测微 仪,是比 游标卡尺 更精密。
D.
25~50mm的千分尺其测量范围与市值范围是不一样的