题目内容
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[单选题]
当洪水涨落变化较快时,为了不至于因测速历时过长而影响流量测验精度,允许测速历时减为()。
A.30s
B.50s
C.60s
D.100s
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A.30s
B.50s
C.60s
D.100s
A.Ⅰ、Ⅱ、Ⅳ
B.Ⅰ、Ⅲ、Ⅳ
C.Ⅱ、Ⅲ
D.Ⅰ、Ⅳ
A.Ⅰ,Ⅱ,Ⅳ
B.Ⅰ,Ⅳ
C.Ⅱ,Ⅲ
D.Ⅰ,Ⅲ,Ⅳ
A.I,II,IV
B.I,IV
C.II,III
D.I,III,IV