直接或复接配线时,分线盒应标明()
A.本局缩写
B.主干电缆号
C.支缆号
D.分线盒号
E.线序
参考答案:B, C, D, E
The government should develop______ system to predict when wildfires occur and give warnings in time.[ ]
A. previous
B. responsible
C. reasonable
D. reliable
“吴健雄星”是一颗小行星,它的密度与地球相同,表面重力加速度是地球的1/400。已知地球的半径是6400km,那么“吴健雄星”的半径应该是
A.256km
B.16km
C.4km
D.2km