【单选题】A car is going around a racetrack at constant speed. The curves around the track have different radii. In which turn is the magnitude of the car's acceleration the greatest?
A.
It is the greatest in the turn with the greatest radius.
B.
It is the greatest in the turn with the smallest radius.
C.
The acceleration is zero everywhere because of the constant speed.
D.
More information is needed to determine the answer.
【单选题】The Security Council has the greatest power in the UN. The main function of it is to maintain international peace and restore peace when conflicts arise. Its decisions are binding on all UN members. T...
【单选题】The human species came into being at the time of the greatest biological diversity in the history of the Earth. Today, as human populations expand and alter the natural environment, they are reducing ...
A.
The reduction in biodiversity represents a setback both for science and for society as a whole.
B.
The material and cultural wealth Of a nation are insignificant when compared with the country's biological wealth.
C.
The human species is in the process of initiating an unprecedented massive extinction episode.
D.
The current decline in species diversity has potentially grave consequences for the human species.