挑战习题
1/5单选题
难度:

1.在国际单位制中,质量的基本单位是()
A N
B kg
C m
D s
提示1:
TuaYr+eJm+mhv+eahOespuWPt++8jOeJm+mhv+aYr+WKm+eahOWNleS9je+8mw==
提示2:
beaYr+exs+eahOespuWPt++8jOexs+aYr+mVv+W6pueahOWNleS9je+8mw==
提示3:
c+aYr+enkueahOespuWPt++8jOenkuaYr+aXtumXtOeahOWNleS9je+8mw==
正确答案:Qg==
QeOAgU7mmK/niZvpob/nmoTnrKblj7fvvIzniZvpob/mmK/lipvnmoTljZXkvY3vvJs8YnI+QuOAgWtn5piv5Y2D5YWL55qE56ym5Y+377yM5Y2D5YWL5piv6LSo6YeP55qE5Y2V5L2N77ybPGJyPkPjgIFt5piv57Gz55qE56ym5Y+377yM57Gz5piv6ZW/5bqm55qE5Y2V5L2N77ybPGJyPkTjgIFz5piv56eS55qE56ym5Y+377yM56eS5piv5pe26Ze055qE5Y2V5L2N77ybPGJyPuaJgOS7pemAieaLqULjgII=