[问答题]
State Einstein's prinn.ltqj* c m)k6q o5wayy 3vo6)ciple of equivalk 4q0jk cvqp6 v1obu24 ye/;klence.
参考答案: No experiment can be performed that could distinguish between a uniform gravitational field and an equivalent uniform acceleration.
or
Gravitational mass is equivalent to inertial mass.