题目内容
（请给出正确答案）
A、
B、
C、
D、
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A、
B、
C、
D、
A、
B、
C、
D、
A. a fictitious sun moving along the celestial equator
B. the visible sun moving along the ecliptic
C. the Moon's motion in relation to the Sun
D. the movement of the first point of Arie
A.base circle
B.slope
C.bottom point
D.top point
Under a force
applied at point
, the trolley with weight
is moving with acceleration a on a horizontal surface. Point
is the mass center of the trolley. By D’Alembert’s Principle, the inertial force on the trolley should be
A、
B、
C、
D、
A、presenting only examples and details instead of main ideas
B、starting with a generalization and moving to specific details
C、beginning with transitional sentences and ending with your thesis
D、starting with specific details and moving to a larger concluding point
Under a forceapplied at point, the trolley with weightis moving with acceleration a on a horizontal surface. Pointis the mass center of the trolley. By D’Alembert’s Principle, the inertial force on the trolley should be
A、
B、
C、
D、
A、If at º 0 and an ¹ 0, then the point moves along a curve with varying speed.
B、If at = constant and an ¹ 0, then the point moves along a curve with uniformly varying speed.
C、If at ¹ 0 and an º 0, then the point moves along a curve with varying speed.
D、If at ¹ 0 and an º 0, then the point moves along a straight line with constant speed.
A．fictitious sun moving along the celestial equator
B．the visible sun moving along the ecliptic
C．the Moon's motion in relation to the Sun
D．the movement of the first point of Arie
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