合建式生物反应池的设计,应符合哪些要求?
参考答案:
生物反应池宜采用圆形,曝气区的有效容积应包括导流区部分。
沉淀区的表面水力负荷宜为0.5~1.0m3/(m2•h)。
American people are wondering whether the newly-elected president and his administration will keep the nation safe and defend it _______ any terrorist attack in the future.
A.to
B.on
C.against
D.with
听诊心音性质改变如"钟摆律"或"胎心律"有何临床意义?