A.1/35
B.1/5
C.1/7
D.1/48
[单选题]ρ=x2y,则该薄片的质量为( ).A.1/35B.1/5C.1/7D.1/48
[单选题]ρ=x2y,则该薄片的质量为( ).A.1/35B.1/5C.1/7D.1/48
[单选题]A.1~2周B.2~4周C.4~6周D.6~12周E.16~20周
[多选题]A.分闸速度B.合闸速度C.平均速度
[多选题]A.分闸速度B.合闸速度C.平均速度
[单选题]A.0B.1C.-1D.λ
[单选题]A.0B.1C.-1D.λ
[单选题]A.R(m-1)(n+1)(x)B.R(n+1)(m-1)(x)C.R(x)(n+1)(m-1)D.R(m-1)(x)
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[问答题]-------------.