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举一反三
【单选题】There has been a lot of hand-wringing over the death of Elizabeth Steinberg. Without blaming anyone in particular, neighbors, friends, social workers, the police and newspaper editors have struggled t...
A.
spoiling children
B.
punishing children
C.
not caring about children
D.
not beating children
【单选题】第12章: 一黑体 在 1600K 时辐射的总能量为 E 1 ,在 1200K 时辐射的总能量为 E 2 ,则 E 1 / E 2 为 :
A.
4/3 ；
B.
64/27 ；
C.
256/81 ；
D.
16/9 。