混凝土配合比的三个比例关系（三个参数）是什么？

单项选择题Two particles of different mass start from rest. The same net force acts on both of them as they move over equal distances. How do their final kinetic energies compare? A、The particle of larger mass has more kinetic energy. B、The particle of smaller mass has more kinetic energy. C、The particles have equal kinetic energies. D、 Either particle might have more kinetic energy.

单项选择题你觉得大学四年你过的充实吗？