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【单选题】
以下说法不正确的是( )A.
在狭义相对论的质量公式中，速率v 是粒子相对于某参考系的运动速率，而不是两个参考系的相对速率．
B.
在狭义相对论的质量公式中，当粒子的运动速率ｖ远远小于光速Ｃ时，粒子的质量回到了经典力学的情况．
C.
当粒子的运动速率ｖ趋于光速Ｃ时，质量趋于无穷大，即不论对物体加多大的力， 也不可能再使它的速度增加。
D.
光子的静止质量是无穷大．
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