(来学网)线性方程y=2.1+0.3x其斜率为
  • A.
    (来学网)0.3
  • B.
    (来学网)0.7
  • C.
    (来学网)2.1
  • D.
    (来学网)6.3
  • E.
    (来学网)2.4