【单选题】To analyze a value motion, what should be done first?
B.
To define the motion .
【单选题】Pitching is angular motion of the vessel about what axis ().
【简答题】What type of motion can be transmitted by hydraulic actuators?A. linear motion B. rotary motion C. both A. and B. D. none of the above
【单选题】听力原文:What is the acceleration? (15)
C.
The motion of a plane.
【单选题】(单选题)下列古桥中,建筑年代最早的是( ).