问一道SAT2物理题英文的
问题描述：
问一道SAT2物理题英文的
A teacher measures and records her own mass to an accuracy of better than percent.Which of the following is most likely the mass that she recorded?
A.6.43kg
B.60kg
C.64.3kg
D.600kg
E.643kg
(C)
COLLEGEBOARD 上的
那个是2/1percent，是多少？
答
C.明显的：
常识,只有B,C有可能.
0.5%乘60=0.3
所以要有+/—0.3的小数位