某水跃发生在坡度θ=17.46°的斜坡上，已知：流量Q=2.0m³/s，渠宽b=2.0m，渠道粗糙系数n=0.014，求跃前水深h₁、跃后水深h₂和水跃长度L_j。

It is not long until the exam; you ought to stop ______...

单项选择题It is not long until the exam; you ought to stop ______ so much television and study a bit more.
    A．watching       B．and watch           C．of watching     D．to watch

有一水跃产生于水平无压圆管中，已知通过的流量Q=1.0m3/s，管径D=1.0m，跃前水深h1=0.4m，求跃...

未知题型有一水跃产生于水平无压圆管中，已知通过的流量Q=1.0m3/s，管径D=1.0m，跃前水深h₁=0.4m，求跃前断面形心在水面下的距离和跃后水深h₂。

______ you fulfill the terms of the credit we will acce...

单项选择题______ you fulfill the terms of the credit we will accept and pay on maturity the draft presented to us under this credit and if required, ______ discounting facilities at current rates.
   A．Provided, provide        B．Provided, providing
   C．Provide, providing        D．Provide, provide