—Sleep well last night?

—Far from that. My next door neighbor ______ music pretty loud.

A．play

B．had played

C．was playing

D．would play

输水管路的直径为150mm，输水量为981kN/h，则断面平均流速υ=( )。

A．4.57m/s

B．5.55m/s

C．5.67m/s

D．4.98m/s