【单选题】Rotating shafts particularly those that run at high speeds, must be designed to avoid operation at speeds.
【单选题】Engine speeds at which resonance can occur are termed ______.
【单选题】从现在到2020年是全面建成小康社会( )期。
【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
【简答题】汽车的公害包括哪些方面?发动机排放的有害气体主要有哪几种?
【简答题】汽车公害的内容,实现汽车环保的途径有哪些。