题干
too much sugar is bad your teeth.
A：Eat; to
B：Eating; to
C：Eating; for
答案(点此获取答案解析）
C
too much sugar is bad your teeth.
A：Eat; to
B：Eating; to
C：Eating; for
和
粒子氦核42He以相同的速率在同一匀强磁场中做匀速圆周运动，轨道半径分别为
和
，周期分别为
和
，则下列选项正确的是（ ）。
