A viscous damper， as used on a marine diesel， is a sealed precision built device which dampens the torsional vibrations in the （）.

Consider an interference between two waves. At a certain position if the vibrations caused by two waves are in phase, they make a destructive interference.? 正确|错误

What is the benefit of floating a wheelset in the bogie A: it allows the wheelsets radial movement B: it fixes thewheelsetrigidly C: it allows the train to travelfaste D: it reduces vibrations from thewheel/rail interface

What is the benefit of floating a wheelset in the bogie? A: It allows the wheelsets radial movement B: It fixes the wheelset rigidly. C: It allows the train to travel faster. D: It reduces vibrations from the wheel/rail interface.

Safe speed is defined as that speed where（）. A: you can stop within your visibility range B: the vessel is not subject to vibrations C: you are traveling slower than surrounding vessels D: you can take proper and effective action to avoid collisio